<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 5.4a -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: http://www.novaworks.co -->
    <!-- Field: Doc-Info; Name: Source; Value: snfc.xfr; Date: 2020%2D08%2D14T02:57:40Z -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x80090002 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef roleURI="http://securitynational.com/role/DocumentAndEntityInformation" xlink:href="snfc-20200630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/BalanceSheets" xlink:href="snfc-20200630.xsd#BalanceSheets" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/BalanceSheetsParenthetical" xlink:href="snfc-20200630.xsd#BalanceSheetsParenthetical" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/StatementsOfIncome" xlink:href="snfc-20200630.xsd#StatementsOfIncome" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/StatementOfComprehensiveIncome" xlink:href="snfc-20200630.xsd#StatementOfComprehensiveIncome" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/StatementsOfCashFlows" xlink:href="snfc-20200630.xsd#StatementsOfCashFlows" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/StatementOfCashFlowsContinued" xlink:href="snfc-20200630.xsd#StatementOfCashFlowsContinued" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/StatementsOfStockholdersEquity" xlink:href="snfc-20200630.xsd#StatementsOfStockholdersEquity" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/BasisOfPresentation" xlink:href="snfc-20200630.xsd#BasisOfPresentation" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure2RecentAccountingPronouncements" xlink:href="snfc-20200630.xsd#idr_Disclosure2RecentAccountingPronouncements" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3Investments" xlink:href="snfc-20200630.xsd#idr_Disclosure3Investments" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSale" xlink:href="snfc-20200630.xsd#idr_Disclosure4LoansHeldForSale" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/StockCompensationPlans" xlink:href="snfc-20200630.xsd#StockCompensationPlans" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure6EarningsPerShare" xlink:href="snfc-20200630.xsd#idr_Disclosure6EarningsPerShare" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/BusinessSegmentInformation" xlink:href="snfc-20200630.xsd#BusinessSegmentInformation" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstruments" xlink:href="snfc-20200630.xsd#idr_Disclosure8FairValueOfFinancialInstruments" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/AllowanceForDoubtfulAccounts" xlink:href="snfc-20200630.xsd#AllowanceForDoubtfulAccounts" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure10DerivativeCommitments" xlink:href="snfc-20200630.xsd#idr_Disclosure10DerivativeCommitments" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/ReinsuranceCommitmentsAndContingencies" xlink:href="snfc-20200630.xsd#ReinsuranceCommitmentsAndContingencies" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/MortgageServicingRights" xlink:href="snfc-20200630.xsd#MortgageServicingRights" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/IncomeTaxes" xlink:href="snfc-20200630.xsd#IncomeTaxes" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/RevenuesFromContractsWithCustomers" xlink:href="snfc-20200630.xsd#RevenuesFromContractsWithCustomers" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/Acquisitions" xlink:href="snfc-20200630.xsd#Acquisitions" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsTables" xlink:href="snfc-20200630.xsd#InvestmentsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/LoansHeldForSaleTables" xlink:href="snfc-20200630.xsd#LoansHeldForSaleTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/Stock-basedCompensationTables" xlink:href="snfc-20200630.xsd#Stock-basedCompensationTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/EarningsPerShareTables" xlink:href="snfc-20200630.xsd#EarningsPerShareTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/BusinessSegmentsInformationTables" xlink:href="snfc-20200630.xsd#BusinessSegmentsInformationTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/FairValueOfFinancialInstrumentsTables" xlink:href="snfc-20200630.xsd#FairValueOfFinancialInstrumentsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/DerivativeCommitmentsTables" xlink:href="snfc-20200630.xsd#DerivativeCommitmentsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/MortgageServicingRightssTables" xlink:href="snfc-20200630.xsd#MortgageServicingRightssTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/RevenuesFromContractsWithCustomersTables" xlink:href="snfc-20200630.xsd#RevenuesFromContractsWithCustomersTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/AcquisitionsTables" xlink:href="snfc-20200630.xsd#AcquisitionsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsHeldToMaturitySecuritiesDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsHeldToMaturitySecuritiesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsScheduleOfUnrealizedLossOnInvestmentsDetails" xlink:href="snfc-20200630.xsd#InvestmentsScheduleOfUnrealizedLossOnInvestmentsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsDetails" xlink:href="snfc-20200630.xsd#InvestmentsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsInvestmentsClassifiedByContractualMaturityDateDetails" xlink:href="snfc-20200630.xsd#InvestmentsInvestmentsClassifiedByContractualMaturityDateDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsGainLossOnInvestmentsDetails" xlink:href="snfc-20200630.xsd#InvestmentsGainLossOnInvestmentsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsNetCarryingAmountOfHeldToMaturitySecuritiesDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsNetCarryingAmountOfHeldToMaturitySecuritiesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfMajorCategoriesOfNetInvestmentIncomeDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsScheduleOfMajorCategoriesOfNetInvestmentIncomeDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsNetInvestmentIncome-AdditionalDetails" xlink:href="snfc-20200630.xsd#InvestmentsNetInvestmentIncome-AdditionalDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsCommercialRealEstateHeldForInvestmentDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsCommercialRealEstateHeldForInvestmentDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsCommercialRealEstateInvestmentDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsCommercialRealEstateInvestmentDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsResidentialRealEstateHeldForInvestmentDetails" xlink:href="snfc-20200630.xsd#InvestmentsResidentialRealEstateHeldForInvestmentDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsResidentialRealEstateInvestmentDetails" xlink:href="snfc-20200630.xsd#InvestmentsResidentialRealEstateInvestmentDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsRealEstateOwnedAndOccupiedByCompanyDetails" xlink:href="snfc-20200630.xsd#InvestmentsRealEstateOwnedAndOccupiedByCompanyDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsScheduleOfAllowanceForLoanLossesAsContra-assetAccountDetails" xlink:href="snfc-20200630.xsd#InvestmentsScheduleOfAllowanceForLoanLossesAsContra-assetAccountDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/InvestmentsScheduleOfAgingOfMortgageLoansDetails" xlink:href="snfc-20200630.xsd#InvestmentsScheduleOfAgingOfMortgageLoansDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfImpairedMortgageLoansDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsScheduleOfImpairedMortgageLoansDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfCreditRiskOfMortgageLoansBasedOnPerformanceStatusDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsScheduleOfCreditRiskOfMortgageLoansBasedOnPerformanceStatusDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsSummaryOfInterestNotAccruedOnNonPerformingMortgageLoansDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsSummaryOfInterestNotAccruedOnNonPerformingMortgageLoansDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfMortgageLoansOnANonaccrualStatusDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure3InvestmentsScheduleOfMortgageLoansOnANonaccrualStatusDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSaleAggregateFairValueLoansHeldForSaleDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure4LoansHeldForSaleAggregateFairValueLoansHeldForSaleDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSaleScheduleOfMortgageFeeIncomeForLoansHeldForSaleDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure4LoansHeldForSaleScheduleOfMortgageFeeIncomeForLoansHeldForSaleDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSaleScheduleOfLoanLossReserveWhichIsIncludedInOtherLiabilitiesAndAccruedExpensesDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure4LoansHeldForSaleScheduleOfLoanLossReserveWhichIsIncludedInOtherLiabilitiesAndAccruedExpensesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure5StockBasedCompensationDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure5StockBasedCompensationDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure5StockBasedCompensationScheduleOfStockInventivePlanChangesDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure5StockBasedCompensationScheduleOfStockInventivePlanChangesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure6EarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure6EarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure6EarningsPerShareDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure6EarningsPerShareDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/BusinessSegmentsInformationScheduleOfRevenuesAndExpensesByReportableSegmentDetails" xlink:href="snfc-20200630.xsd#BusinessSegmentsInformationScheduleOfRevenuesAndExpensesByReportableSegmentDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstrumentsScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure8FairValueOfFinancialInstrumentsScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20191231/role/idr_Disclosure17FairValueOfFinancialInstrumentsScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure17FairValueOfFinancialInstrumentsScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstrumentsScheduleOfChangesInTheConsolidatedBalanceSheetLineItemsMeasuredUsingLevel3InputsDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure8FairValueOfFinancialInstrumentsScheduleOfChangesInTheConsolidatedBalanceSheetLineItemsMeasuredUsingLevel3InputsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstrumentsFairValueAssetsMeasuredOnANonrecurringBasisDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure8FairValueOfFinancialInstrumentsFairValueAssetsMeasuredOnANonrecurringBasisDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/FairValueOfFinancialInstrumentsScheduleOfFinancialInstrumentsCarriedAtOtherThanFairValueDetails" xlink:href="snfc-20200630.xsd#FairValueOfFinancialInstrumentsScheduleOfFinancialInstrumentsCarriedAtOtherThanFairValueDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/DerivativeInstrumentsScheduleOfDerivativeAssetsAtFairValueDetails" xlink:href="snfc-20200630.xsd#DerivativeInstrumentsScheduleOfDerivativeAssetsAtFairValueDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/DerivativeInstrumentsScheduleOfGainsAndLossesOnDerivativesDetails" xlink:href="snfc-20200630.xsd#DerivativeInstrumentsScheduleOfGainsAndLossesOnDerivativesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure11ReinsuranceCommitmentsAndContingenciesMortgageLoanLossSettlementsDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure11ReinsuranceCommitmentsAndContingenciesMortgageLoanLossSettlementsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure11ReinsuranceCommitmentsAndContingenciesOtherContingenciesAndCommitmentsDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure11ReinsuranceCommitmentsAndContingenciesOtherContingenciesAndCommitmentsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsScheduleOfMortgageServicingRightsDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure12MortgageServicingRightsScheduleOfMortgageServicingRightsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsScheduleOfFiniteLivedIntangibleAssetsFutureAmortizationExpenseMortgageServicingRightsDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure12MortgageServicingRightsScheduleOfFiniteLivedIntangibleAssetsFutureAmortizationExpenseMortgageServicingRightsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsScheduleOfOtherRevenuesDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure12MortgageServicingRightsScheduleOfOtherRevenuesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsSummaryOfUnpaidPrincipalBalancesOfTheServicingPortfolioDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure12MortgageServicingRightsSummaryOfUnpaidPrincipalBalancesOfTheServicingPortfolioDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/MortgageServicingRightsAssumptionsUsedInDeterminingMsrValueDetails" xlink:href="snfc-20200630.xsd#MortgageServicingRightsAssumptionsUsedInDeterminingMsrValueDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure13IncomeTaxesDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure13IncomeTaxesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/RevenuesFromContractsWithCustomersScheduleOfOpeningAndClosingBalancesOfReceivablesContractAssetsAndContractLiabilitiesDetails" xlink:href="snfc-20200630.xsd#RevenuesFromContractsWithCustomersScheduleOfOpeningAndClosingBalancesOfReceivablesContractAssetsAndContractLiabilitiesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/RevenuesFromContractsWithCustomersDetails" xlink:href="snfc-20200630.xsd#RevenuesFromContractsWithCustomersDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/RevenuesFromContractsWithCustomersRevenuesOfCemeteryAndMortuaryContractsDetails" xlink:href="snfc-20200630.xsd#RevenuesFromContractsWithCustomersRevenuesOfCemeteryAndMortuaryContractsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/20190930/role/idr_Disclosure14RevenuesFromContractsWithCustomersReconciliationOfRevenuesFromCemeteryAndMortuaryContractsToBusinessSegmentInformationDetails" xlink:href="snfc-20200630.xsd#idr_Disclosure14RevenuesFromContractsWithCustomersReconciliationOfRevenuesFromCemeteryAndMortuaryContractsToBusinessSegmentInformationDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://securitynational.com/role/AcquisitionsEstimatedFairValuesOfAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:href="snfc-20200630.xsd#AcquisitionsEstimatedFairValuesOfAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:type="simple" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/DocumentAndEntityInformation" xlink:title="00000001 - Document - Document and Entity Information">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaapCommonClassAMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassAMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaapCommonClassCMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassCMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_deiEntityCentralIndexKey_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityCentralIndexKey_40" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_deiCurrentFiscalYearEndDate_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiCurrentFiscalYearEndDate_40" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_deiEntityRegistrantName_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityRegistrantName_40" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType" xlink:label="loc_deiDocumentType_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiDocumentType_40" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_deiDocumentPeriodEndDate_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiDocumentPeriodEndDate_40" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol" xlink:label="loc_deiTradingSymbol_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiTradingSymbol_40" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName" xlink:label="loc_deiSecurityExchangeName_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiSecurityExchangeName_40" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_deiEntityTaxIdentificationNumber_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityTaxIdentificationNumber_40" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_deiEntityCommonStockSharesOutstanding_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityCommonStockSharesOutstanding_40" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_deiEntityPublicFloat_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityPublicFloat_40" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_deiEntityFilerCategory_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityFilerCategory_40" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_deiEntityCurrentReportingStatus_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityCurrentReportingStatus_40" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_deiEntityInteractiveDataCurrent_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityInteractiveDataCurrent_40" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_deiEntityVoluntaryFilers_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityVoluntaryFilers_40" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_deiEntityWellKnownSeasonedIssuer_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityWellKnownSeasonedIssuer_40" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityShellCompany" xlink:label="loc_deiEntityShellCompany_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityShellCompany_40" xlink:type="arc" order="15" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_deiEntitySmallBusiness_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntitySmallBusiness_40" xlink:type="arc" order="16" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_deiEntityEmergingGrowthCompany_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityEmergingGrowthCompany_40" xlink:type="arc" order="17" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityExTransitionPeriod" xlink:label="loc_deiEntityExTransitionPeriod_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityExTransitionPeriod_40" xlink:type="arc" order="18" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentDescription" xlink:label="loc_deiAmendmentDescription_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiAmendmentDescription_40" xlink:type="arc" order="19" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_deiEntityIncorporationStateCountryCode_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityIncorporationStateCountryCode_40" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber" xlink:label="loc_deiEntityFileNumber_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityFileNumber_40" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_deiEntityAddressAddressLine1_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityAddressAddressLine1_40" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="loc_deiEntityAddressAddressLine2_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityAddressAddressLine2_40" xlink:type="arc" order="23" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_deiEntityAddressCityOrTown_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityAddressCityOrTown_40" xlink:type="arc" order="24" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_deiEntityAddressStateOrProvince_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityAddressStateOrProvince_40" xlink:type="arc" order="25" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_deiEntityAddressPostalZipCode_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiEntityAddressPostalZipCode_40" xlink:type="arc" order="26" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode" xlink:label="loc_deiCityAreaCode_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiCityAreaCode_40" xlink:type="arc" order="27" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber" xlink:label="loc_deiLocalPhoneNumber_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiLocalPhoneNumber_40" xlink:type="arc" order="28" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_deiAmendmentFlag_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiAmendmentFlag_40" xlink:type="arc" order="29" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_deiDocumentFiscalYearFocus_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiDocumentFiscalYearFocus_40" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_deiDocumentFiscalPeriodFocus_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiDocumentFiscalPeriodFocus_40" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentQuarterlyReport" xlink:label="loc_deiDocumentQuarterlyReport_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiDocumentQuarterlyReport_40" xlink:type="arc" order="32" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentTransitionReport" xlink:label="loc_deiDocumentTransitionReport_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_deiDocumentTransitionReport_40" xlink:type="arc" order="33" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/BalanceSheets" xlink:title="00000002 - Statement - Condensed Consolidated Balance Sheets (Unaudited)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaapCommonClassAMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassAMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaapCommonClassBMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassBMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaapCommonClassCMember_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassCMember_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaapAssetsAbstract_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAssetsAbstract_90" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsAbstract" xlink:label="loc_us-gaapInvestmentsAbstract_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapInvestmentsAbstract_90" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecurities" xlink:label="loc_us-gaapHeldToMaturitySecurities_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_us-gaapHeldToMaturitySecurities_90" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecurities" xlink:label="loc_us-gaapAvailableForSaleSecuritiesEquitySecurities_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_us-gaapAvailableForSaleSecuritiesEquitySecurities_90" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet" xlink:label="loc_us-gaapMortgageLoansOnRealEstateCommercialAndConsumerNet_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_us-gaapMortgageLoansOnRealEstateCommercialAndConsumerNet_90" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyNet" xlink:label="loc_us-gaapRealEstateInvestmentPropertyNet_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_us-gaapRealEstateInvestmentPropertyNet_90" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateHeldforsale" xlink:label="loc_us-gaapRealEstateHeldforsale_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_us-gaapRealEstateHeldforsale_90" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PolicyAndOtherLoansReceivableNet1" xlink:label="loc_snfcPolicyAndOtherLoansReceivableNet1_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_snfcPolicyAndOtherLoansReceivableNet1_90" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedInvestmentIncomeReceivable" xlink:label="loc_us-gaapAccruedInvestmentIncomeReceivable_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_us-gaapAccruedInvestmentIncomeReceivable_90" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Investments" xlink:label="loc_us-gaapInvestments_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentsAbstract_90" xlink:to="loc_us-gaapInvestments_90" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaapCashAndCashEquivalentsAtCarryingValue_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapCashAndCashEquivalentsAtCarryingValue_90" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LoansHeldForSale" xlink:label="loc_snfcLoansHeldForSale_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_snfcLoansHeldForSale_90" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNet" xlink:label="loc_us-gaapAccountsReceivableNet_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapAccountsReceivableNet_90" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedInvestments" xlink:label="loc_us-gaapRestrictedInvestments_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapRestrictedInvestments_90" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteryPerpetualCareTrustInvestments" xlink:label="loc_snfcCemeteryPerpetualCareTrustInvestments_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_snfcCemeteryPerpetualCareTrustInvestments_90" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ReinsuranceReserveCreditForLosses" xlink:label="loc_snfcReinsuranceReserveCreditForLosses_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_snfcReinsuranceReserveCreditForLosses_90" xlink:type="arc" order="15" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryLandHeldForSale" xlink:label="loc_us-gaapInventoryLandHeldForSale_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapInventoryLandHeldForSale_90" xlink:type="arc" order="16" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredPolicyAcquisitionCosts" xlink:label="loc_us-gaapDeferredPolicyAcquisitionCosts_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapDeferredPolicyAcquisitionCosts_90" xlink:type="arc" order="17" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageServicingRightsNet" xlink:label="loc_snfcMortgageServicingRightsNet_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_snfcMortgageServicingRightsNet_90" xlink:type="arc" order="18" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet_90" xlink:type="arc" order="19" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValueOfBusinessAcquiredVOBA" xlink:label="loc_us-gaapValueOfBusinessAcquiredVOBA_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapValueOfBusinessAcquiredVOBA_90" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaapGoodwill_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapGoodwill_90" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_us-gaapOtherAssets_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapOtherAssets_90" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAssetsAbstract_90" xlink:to="loc_us-gaapAssets_90" xlink:type="arc" order="23" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaapLiabilitiesAndStockholdersEquityAbstract_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLiabilitiesAndStockholdersEquityAbstract_90" xlink:type="arc" order="24" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaapLiabilitiesAbstract_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLiabilitiesAbstract_90" xlink:type="arc" order="25" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense" xlink:label="loc_us-gaapLiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapLiabilityForFuturePolicyBenefitsAndUnpaidClaimsAndClaimsAdjustmentExpense_90" xlink:type="arc" order="26" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnearnedPremiums" xlink:label="loc_us-gaapUnearnedPremiums_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapUnearnedPremiums_90" xlink:type="arc" order="27" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansPayableToBank" xlink:label="loc_us-gaapLoansPayableToBank_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapLoansPayableToBank_90" xlink:type="arc" order="28" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredRevenue" xlink:label="loc_us-gaapDeferredRevenue_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapDeferredRevenue_90" xlink:type="arc" order="29" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteryPerpetualCareTrustObligation" xlink:label="loc_snfcCemeteryPerpetualCareTrustObligation_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_snfcCemeteryPerpetualCareTrustObligation_90" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:label="loc_us-gaapAccountsPayableCurrentAndNoncurrent_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapAccountsPayableCurrentAndNoncurrent_90" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilities" xlink:label="loc_us-gaapOtherLiabilities_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapOtherLiabilities_90" xlink:type="arc" order="32" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities" xlink:label="loc_us-gaapDeferredIncomeTaxLiabilities_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapDeferredIncomeTaxLiabilities_90" xlink:type="arc" order="33" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLiabilitiesAbstract_90" xlink:to="loc_us-gaapLiabilities_90" xlink:type="arc" order="34" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaapStockholdersEquityAbstract_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockholdersEquityAbstract_90" xlink:type="arc" order="35" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaapPreferredStockValue_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapPreferredStockValue_90" xlink:type="arc" order="36" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapCommonStockValue_90" xlink:type="arc" order="37" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaapAdditionalPaidInCapitalCommonStock_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapAdditionalPaidInCapitalCommonStock_90" xlink:type="arc" order="38" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax_90" xlink:type="arc" order="39" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaapRetainedEarningsAccumulatedDeficit_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapRetainedEarningsAccumulatedDeficit_90" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaapTreasuryStockValue_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapTreasuryStockValue_90" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapStockholdersEquity_90" xlink:type="arc" order="42" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaapLiabilitiesAndStockholdersEquity_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStockholdersEquityAbstract_90" xlink:to="loc_us-gaapLiabilitiesAndStockholdersEquity_90" xlink:type="arc" order="43" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/BalanceSheetsParenthetical" xlink:title="00000003 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaapCommonClassAMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassAMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="loc_us-gaapCommonClassBMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassBMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaapCommonClassCMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassCMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForLoanAndLeaseLossesRealEstate" xlink:label="loc_us-gaapAllowanceForLoanAndLeaseLossesRealEstate_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAllowanceForLoanAndLeaseLossesRealEstate_90" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:label="loc_us-gaapRealEstateInvestmentPropertyAccumulatedDepreciation_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateInvestmentPropertyAccumulatedDepreciation_90" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables" xlink:label="loc_us-gaapAllowanceForDoubtfulAccountsPremiumsAndOtherReceivables_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAllowanceForDoubtfulAccountsPremiumsAndOtherReceivables_90" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable" xlink:label="loc_us-gaapAllowanceForDoubtfulAccountsReceivable_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAllowanceForDoubtfulAccountsReceivable_90" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AggregateFairValueRestrictedAssets" xlink:label="loc_snfcAggregateFairValueRestrictedAssets_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAggregateFairValueRestrictedAssets_90" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AggregateFairValueCemetaryPerpetualCareTrustInvestments" xlink:label="loc_snfcAggregateFairValueCemetaryPerpetualCareTrustInvestments_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAggregateFairValueCemetaryPerpetualCareTrustInvestments_90" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaapPreferredStockParOrStatedValuePerShare_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPreferredStockParOrStatedValuePerShare_90" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaapPreferredStockSharesAuthorized_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPreferredStockSharesAuthorized_90" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaapPreferredStockSharesIssued_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPreferredStockSharesIssued_90" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaapPreferredStockSharesOutstanding_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapPreferredStockSharesOutstanding_90" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaapCommonStockParOrStatedValuePerShare_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockParOrStatedValuePerShare_90" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaapCommonStockSharesAuthorized_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockSharesAuthorized_90" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaapCommonStockSharesIssued_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockSharesIssued_90" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaapCommonStockSharesOutstanding_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockSharesOutstanding_90" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaapTreasuryStockShares_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapTreasuryStockShares_90" xlink:type="arc" order="14" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/StatementsOfIncome" xlink:title="00000004 - Statement - Condensed Consolidated Statements of Income (Unaudited)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/StatementOfComprehensiveIncome" xlink:title="00000005 - Statement - Condensed Consolidated Statement of Comprehensive Income (Unaudited)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/StatementsOfCashFlows" xlink:title="00000006 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/StatementOfCashFlowsContinued" xlink:title="00000007 - Statement - Condensed Consolidated Statement of Cash Flows (Continued)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/StatementsOfStockholdersEquity" xlink:title="00000008 - Statement - Condensed Consolidated Statements of Stockholders&#8217; Equity (Unaudited)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementEquityComponentsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ClassACommonStockMember" xlink:label="loc_snfcClassACommonStockMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_snfcClassACommonStockMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ClassCCommonStockMember" xlink:label="loc_snfcClassCCommonStockMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_snfcClassCCommonStockMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaapAdditionalPaidInCapitalMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapAdditionalPaidInCapitalMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapAccumulatedOtherComprehensiveIncomeMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaapRetainedEarningsMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapRetainedEarningsMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaapTreasuryStockMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapTreasuryStockMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockholdersEquity_80" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaapProfitLoss_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapProfitLoss_80" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaapOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_80" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaapAllocatedShareBasedCompensationExpense_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAllocatedShareBasedCompensationExpense_80" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ExerciseOfStockOptions" xlink:label="loc_snfcExerciseOfStockOptions_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcExerciseOfStockOptions_80" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SaleOfTreasuryStock" xlink:label="loc_snfcSaleOfTreasuryStock_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSaleOfTreasuryStock_80" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PurchaseOfTreasuryStock" xlink:label="loc_snfcPurchaseOfTreasuryStock_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcPurchaseOfTreasuryStock_80" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_StockDividends" xlink:label="loc_snfcStockDividends_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcStockDividends_80" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ConversionClassCToClassA" xlink:label="loc_snfcConversionClassCToClassA_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcConversionClassCToClassA_80" xlink:type="arc" order="9" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/BasisOfPresentation" xlink:title="00000009 - Disclosure - 1) Basis of Presentation" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure2RecentAccountingPronouncements" xlink:title="00000010 - Disclosure - 2) Recent Accounting Pronouncements" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3Investments" xlink:title="00000011 - Disclosure - 3) Investments" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSale" xlink:title="00000012 - Disclosure - 4) Loans Held For Sale" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/StockCompensationPlans" xlink:title="00000013 - Disclosure - 5) Stock Compensation Plans" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure6EarningsPerShare" xlink:title="00000014 - Disclosure - 6) Earnings Per Share" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/BusinessSegmentInformation" xlink:title="00000015 - Disclosure - 7) Business Segment Information" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstruments" xlink:title="00000016 - Disclosure - 8) Fair Value of Financial Instruments" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/AllowanceForDoubtfulAccounts" xlink:title="00000017 - Disclosure - 9) Allowance For Doubtful Accounts" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure10DerivativeCommitments" xlink:title="00000018 - Disclosure - 10) Derivative Instruments" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/ReinsuranceCommitmentsAndContingencies" xlink:title="00000019 - Disclosure - 11) Reinsurance, Commitments and Contingencies" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/MortgageServicingRights" xlink:title="00000020 - Disclosure - 12) Mortgage Servicing Rights" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/IncomeTaxes" xlink:title="00000021 - Disclosure - 13) Income Taxes" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/RevenuesFromContractsWithCustomers" xlink:title="00000022 - Disclosure - 14) Revenues From Contracts With Customers" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/Acquisitions" xlink:title="00000023 - Disclosure - 15) Acquisitions" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsTables" xlink:title="00000024 - Disclosure - 3) Investments (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/LoansHeldForSaleTables" xlink:title="00000025 - Disclosure - 4) Loans Held For Sale (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/Stock-basedCompensationTables" xlink:title="00000026 - Disclosure - 5) Stock-based Compensation (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/EarningsPerShareTables" xlink:title="00000027 - Disclosure - 6) Earnings Per Share (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/BusinessSegmentsInformationTables" xlink:title="00000028 - Disclosure - 7) Business Segments Information (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/FairValueOfFinancialInstrumentsTables" xlink:title="00000029 - Disclosure - 8) Fair Value of Financial Instruments (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/DerivativeCommitmentsTables" xlink:title="00000030 - Disclosure - 10) Derivative Instruments (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/MortgageServicingRightssTables" xlink:title="00000031 - Disclosure - 12) Mortgage Servicing Rightss (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/RevenuesFromContractsWithCustomersTables" xlink:title="00000032 - Disclosure - 14) Revenues From Contracts With Customers (Tables)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/AcquisitionsTables" xlink:title="00000033 - Disclosure - 15) Acquisitions (Tables)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ProbstFamilyFuneralsAndCremationsAndHeberValleyFuneralHomeMember" xlink:label="loc_snfcProbstFamilyFuneralsAndCremationsAndHeberValleyFuneralHomeMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_snfcProbstFamilyFuneralsAndCremationsAndHeberValleyFuneralHomeMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_KilpatrickMember" xlink:label="loc_snfcKilpatrickMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_snfcKilpatrickMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaapScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_30" xlink:type="arc" order="0" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsHeldToMaturitySecuritiesDetails" xlink:title="00000034 - Disclosure - 3) Investments: Held-to-maturity Securities (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="loc_us-gaapUSTreasurySecuritiesMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapUSTreasurySecuritiesMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaapUSStatesAndPoliticalSubdivisionsMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapUSStatesAndPoliticalSubdivisionsMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaapCorporateDebtSecuritiesMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapCorporateDebtSecuritiesMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaapMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RedeemablePreferredStockMember" xlink:label="loc_us-gaapRedeemablePreferredStockMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapRedeemablePreferredStockMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_IndustrialMiscellaneousAndAllOtherMember" xlink:label="loc_snfcIndustrialMiscellaneousAndAllOtherMember_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcIndustrialMiscellaneousAndAllOtherMember_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_EquitySecurities1Member" xlink:label="loc_snfcEquitySecurities1Member_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcEquitySecurities1Member_70" xlink:type="arc" order="71" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaapResidentialMortgageMember_160" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapResidentialMortgageMember_160" xlink:type="arc" order="161" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialConstructionMember" xlink:label="loc_snfcResidentialConstructionMember_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcResidentialConstructionMember_170" xlink:type="arc" order="171" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CommercialMember" xlink:label="loc_snfcCommercialMember_180" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcCommercialMember_180" xlink:type="arc" order="181" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationAxis" xlink:label="loc_snfcTimeDurationAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcTimeDurationAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationDomain" xlink:label="loc_snfcTimeDurationDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcTimeDurationAxis" xlink:to="loc_snfcTimeDurationDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationDomain" xlink:label="loc_snfcTimeDurationDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcTimeDurationAxis" xlink:to="loc_snfcTimeDurationDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TotalMember" xlink:label="loc_snfcTotalMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcTimeDurationDomain" xlink:to="loc_snfcTotalMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment" xlink:label="loc_us-gaapHeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapHeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_410" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_HeldToMaturitySecuritiesUnrecognizedHoldingGain" xlink:label="loc_snfcHeldToMaturitySecuritiesUnrecognizedHoldingGain_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcHeldToMaturitySecuritiesUnrecognizedHoldingGain_410" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_HeldToMaturitySecuritiesUnrecognizedHoldingLoss" xlink:label="loc_snfcHeldToMaturitySecuritiesUnrecognizedHoldingLoss_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcHeldToMaturitySecuritiesUnrecognizedHoldingLoss_410" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_HeldToMaturitySecuritiesEstimatedFairValue" xlink:label="loc_snfcHeldToMaturitySecuritiesEstimatedFairValue_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcHeldToMaturitySecuritiesEstimatedFairValue_410" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:label="loc_us-gaapAvailableForSaleSecuritiesAmortizedCost_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAvailableForSaleSecuritiesAmortizedCost_410" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains" xlink:label="loc_us-gaapAvailableForSaleSecuritiesGrossUnrealizedGains_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAvailableForSaleSecuritiesGrossUnrealizedGains_410" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AvailableForSaleSecuritiesGrossUnrealizedLosses" xlink:label="loc_snfcAvailableForSaleSecuritiesGrossUnrealizedLosses_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAvailableForSaleSecuritiesGrossUnrealizedLosses_410" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AvailableForSaleSecuritiesEstimatedFairValue" xlink:label="loc_snfcAvailableForSaleSecuritiesEstimatedFairValue_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAvailableForSaleSecuritiesEstimatedFairValue_410" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansOnRealEstateAndConstruction" xlink:label="loc_snfcMortgageLoansOnRealEstateAndConstruction_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansOnRealEstateAndConstruction_410" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansOnRealEstateAndConstructionUnamortizedDeferredLoanFeesNet" xlink:label="loc_snfcMortgageLoansOnRealEstateAndConstructionUnamortizedDeferredLoanFeesNet_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansOnRealEstateAndConstructionUnamortizedDeferredLoanFeesNet_410" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansOnRealEstateAndConstructionAllowanceForLosses" xlink:label="loc_snfcMortgageLoansOnRealEstateAndConstructionAllowanceForLosses_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansOnRealEstateAndConstructionAllowanceForLosses_410" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansOnRealEstateAndConstructionDiscount" xlink:label="loc_snfcMortgageLoansOnRealEstateAndConstructionDiscount_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansOnRealEstateAndConstructionDiscount_410" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestments" xlink:label="loc_us-gaapRealEstateInvestments_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateInvestments_410" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateHeldforsale" xlink:label="loc_us-gaapRealEstateHeldforsale_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateHeldforsale_410" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PolicyLoansAmortizedCost" xlink:label="loc_snfcPolicyLoansAmortizedCost_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcPolicyLoansAmortizedCost_410" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_InsuranceAssignmentsAmortizedCost" xlink:label="loc_snfcInsuranceAssignmentsAmortizedCost_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcInsuranceAssignmentsAmortizedCost_410" xlink:type="arc" order="15" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FederalHomeLoanBankStockAmortizedCost" xlink:label="loc_snfcFederalHomeLoanBankStockAmortizedCost_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFederalHomeLoanBankStockAmortizedCost_410" xlink:type="arc" order="16" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_OtherInvestmentsAmortizedCost" xlink:label="loc_snfcOtherInvestmentsAmortizedCost_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcOtherInvestmentsAmortizedCost_410" xlink:type="arc" order="17" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AllowanceForDoubtfulAccounts" xlink:label="loc_snfcAllowanceForDoubtfulAccounts_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAllowanceForDoubtfulAccounts_410" xlink:type="arc" order="18" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup" xlink:label="loc_us-gaapLoansReceivableHeldForSaleNetNotPartOfDisposalGroup_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLoansReceivableHeldForSaleNetNotPartOfDisposalGroup_410" xlink:type="arc" order="19" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedInvestmentIncomeReceivable" xlink:label="loc_us-gaapAccruedInvestmentIncomeReceivable_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAccruedInvestmentIncomeReceivable_410" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Investments" xlink:label="loc_us-gaapInvestments_410" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapInvestments_410" xlink:type="arc" order="21" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsScheduleOfUnrealizedLossOnInvestmentsDetails" xlink:title="00000035 - Disclosure - 3) Investments: Schedule of Unrealized Loss on Investments (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember" xlink:label="loc_us-gaapUSStatesAndPoliticalSubdivisionsMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapUSStatesAndPoliticalSubdivisionsMember_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CorporateSecuritiesMember" xlink:label="loc_snfcCorporateSecuritiesMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcCorporateSecuritiesMember_10" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaapMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_20" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RedeemablePreferredStockMember" xlink:label="loc_us-gaapRedeemablePreferredStockMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapRedeemablePreferredStockMember_30" xlink:type="arc" order="32" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TotalUnrealizedLossesMember" xlink:label="loc_snfcTotalUnrealizedLossesMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcTotalUnrealizedLossesMember_40" xlink:type="arc" order="42" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="loc_us-gaapUSTreasurySecuritiesMember_300" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapUSTreasurySecuritiesMember_300" xlink:type="arc" order="302" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationAxis" xlink:label="loc_snfcTimeDurationAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcTimeDurationAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationDomain" xlink:label="loc_snfcTimeDurationDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcTimeDurationAxis" xlink:to="loc_snfcTimeDurationDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationDomain" xlink:label="loc_snfcTimeDurationDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcTimeDurationAxis" xlink:to="loc_snfcTimeDurationDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LessThan12MonthsMember" xlink:label="loc_snfcLessThan12MonthsMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcTimeDurationDomain" xlink:to="loc_snfcLessThan12MonthsMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MoreThan12MonthsMember" xlink:label="loc_snfcMoreThan12MonthsMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcTimeDurationDomain" xlink:to="loc_snfcMoreThan12MonthsMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_HeldToMaturitySecuritiesUnrecognizedHoldingLoss" xlink:label="loc_snfcHeldToMaturitySecuritiesUnrecognizedHoldingLoss_610" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcHeldToMaturitySecuritiesUnrecognizedHoldingLoss_610" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaapHeldToMaturitySecuritiesFairValue_610" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapHeldToMaturitySecuritiesFairValue_610" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsDetails" xlink:title="00000036 - Disclosure - 3) Investments (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsInvestmentsClassifiedByContractualMaturityDateDetails" xlink:title="00000037 - Disclosure - 3) Investments: Investments Classified by Contractual Maturity Date (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember" xlink:label="loc_us-gaapMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RedeemablePreferredStockMember" xlink:label="loc_us-gaapRedeemablePreferredStockMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapRedeemablePreferredStockMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ContractualMaturityAxis" xlink:label="loc_snfcContractualMaturityAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcContractualMaturityAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ContractualMaturityDomain" xlink:label="loc_snfcContractualMaturityDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcContractualMaturityAxis" xlink:to="loc_snfcContractualMaturityDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ContractualMaturityDomain" xlink:label="loc_snfcContractualMaturityDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcContractualMaturityAxis" xlink:to="loc_snfcContractualMaturityDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DueIn1yearMember" xlink:label="loc_snfcDueIn1yearMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcContractualMaturityDomain" xlink:to="loc_snfcDueIn1yearMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DueIn25YearsMember" xlink:label="loc_snfcDueIn25YearsMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcContractualMaturityDomain" xlink:to="loc_snfcDueIn25YearsMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DueIn510YearsMember" xlink:label="loc_snfcDueIn510YearsMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcContractualMaturityDomain" xlink:to="loc_snfcDueIn510YearsMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DueInMoreThan10YearsMember" xlink:label="loc_snfcDueInMoreThan10YearsMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcContractualMaturityDomain" xlink:to="loc_snfcDueInMoreThan10YearsMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment" xlink:label="loc_us-gaapHeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapHeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment_80" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_HeldToMaturitySecuritiesEstimatedFairValue" xlink:label="loc_snfcHeldToMaturitySecuritiesEstimatedFairValue_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcHeldToMaturitySecuritiesEstimatedFairValue_80" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsGainLossOnInvestmentsDetails" xlink:title="00000038 - Disclosure - 3) Investments: Gain (Loss) on Investments (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GainsLossesOnInvestmentsByCategoryAxis" xlink:label="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GainsLossesOnInvestmentsByCategoryDomain" xlink:label="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" xlink:to="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GainsLossesOnInvestmentsByCategoryDomain" xlink:label="loc_snfcGainsLossesOnInvestmentsByCategoryDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" xlink:to="loc_snfcGainsLossesOnInvestmentsByCategoryDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_EquitySecurities1Member" xlink:label="loc_snfcEquitySecurities1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" xlink:to="loc_snfcEquitySecurities1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_HeldToMaturitySecurities1Member" xlink:label="loc_snfcHeldToMaturitySecurities1Member_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" xlink:to="loc_snfcHeldToMaturitySecurities1Member_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_OtherAssets1Member" xlink:label="loc_snfcOtherAssets1Member_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" xlink:to="loc_snfcOtherAssets1Member_80" xlink:type="arc" order="81" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GrossRealizedGains" xlink:label="loc_snfcGrossRealizedGains_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcGrossRealizedGains_170" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GrossRealizedLosses" xlink:label="loc_snfcGrossRealizedLosses_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcGrossRealizedLosses_170" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GainsandLossesOnSecuritiesSoldInCurrentYear" xlink:label="loc_snfcGainsandLossesOnSecuritiesSoldInCurrentYear_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcGainsandLossesOnSecuritiesSoldInCurrentYear_170" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_UnrealizedGainsAndLossesOnSecuritiesHeldAtEndOfPeriod" xlink:label="loc_snfcUnrealizedGainsAndLossesOnSecuritiesHeldAtEndOfPeriod_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcUnrealizedGainsAndLossesOnSecuritiesHeldAtEndOfPeriod_170" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FixedMaturitySecuritiesHeldToMaturity" xlink:label="loc_snfcFixedMaturitySecuritiesHeldToMaturity_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFixedMaturitySecuritiesHeldToMaturity_170" xlink:type="arc" order="4" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsNetCarryingAmountOfHeldToMaturitySecuritiesDetails" xlink:title="00000039 - Disclosure - 3) Investments: Net carrying amount of held to maturity securities (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GainsLossesOnInvestmentsByCategoryAxis" xlink:label="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GainsLossesOnInvestmentsByCategoryDomain" xlink:label="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" xlink:to="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GainsLossesOnInvestmentsByCategoryDomain" xlink:label="loc_snfcGainsLossesOnInvestmentsByCategoryDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryAxis" xlink:to="loc_snfcGainsLossesOnInvestmentsByCategoryDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_HeldToMaturitySecurities1Member" xlink:label="loc_snfcHeldToMaturitySecurities1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcGainsLossesOnInvestmentsByCategoryDomain" xlink:to="loc_snfcHeldToMaturitySecurities1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetCarryingAmountForSalesOfSecurities" xlink:label="loc_snfcNetCarryingAmountForSalesOfSecurities_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcNetCarryingAmountForSalesOfSecurities_30" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetRealizedLossRelatedToSalesOfSecurities" xlink:label="loc_snfcNetRealizedLossRelatedToSalesOfSecurities_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcNetRealizedLossRelatedToSalesOfSecurities_30" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ProceedsReceivedFromSaleOfFixedMaturityAvailableForSaleSecurities" xlink:label="loc_snfcProceedsReceivedFromSaleOfFixedMaturityAvailableForSaleSecurities_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcProceedsReceivedFromSaleOfFixedMaturityAvailableForSaleSecurities_30" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GrossRealizedGain" xlink:label="loc_snfcGrossRealizedGain_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcGrossRealizedGain_30" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GrossRealizedLoss" xlink:label="loc_snfcGrossRealizedLoss_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcGrossRealizedLoss_30" xlink:type="arc" order="4" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfMajorCategoriesOfNetInvestmentIncomeDetails" xlink:title="00000040 - Disclosure - 3) Investments: Schedule of Major categories of net investment income (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FixedMaturities1Member" xlink:label="loc_snfcFixedMaturities1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcFixedMaturities1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_EquitySecurities1Member" xlink:label="loc_snfcEquitySecurities1Member_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcEquitySecurities1Member_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansRealEstateMember" xlink:label="loc_snfcMortgageLoansRealEstateMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcMortgageLoansRealEstateMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RealEstate1Member" xlink:label="loc_snfcRealEstate1Member_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcRealEstate1Member_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PolicyStudentAndOtherLoansMember" xlink:label="loc_snfcPolicyStudentAndOtherLoansMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcPolicyStudentAndOtherLoansMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_InsuranceAssignmentsMember" xlink:label="loc_snfcInsuranceAssignmentsMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcInsuranceAssignmentsMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_OtherInvestments1Member" xlink:label="loc_snfcOtherInvestments1Member_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcOtherInvestments1Member_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CashAndCashEquivalents1Member" xlink:label="loc_snfcCashAndCashEquivalents1Member_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcCashAndCashEquivalents1Member_70" xlink:type="arc" order="71" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_GrossInvestmentIncome" xlink:label="loc_snfcGrossInvestmentIncome_370" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcGrossInvestmentIncome_370" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeInvestmentExpense" xlink:label="loc_us-gaapInvestmentIncomeInvestmentExpense_370" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapInvestmentIncomeInvestmentExpense_370" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetInvestmentIncome" xlink:label="loc_us-gaapNetInvestmentIncome_370" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNetInvestmentIncome_370" xlink:type="arc" order="2" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsNetInvestmentIncome-AdditionalDetails" xlink:title="00000041 - Disclosure - 3) Investments: Net Investment Income - Additional (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RestrictedAssetsAxis" xlink:label="loc_snfcRestrictedAssetsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcRestrictedAssetsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RestrictedAssetsDomain" xlink:label="loc_snfcRestrictedAssetsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcRestrictedAssetsAxis" xlink:to="loc_snfcRestrictedAssetsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RestrictedAssetsDomain" xlink:label="loc_snfcRestrictedAssetsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcRestrictedAssetsAxis" xlink:to="loc_snfcRestrictedAssetsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteriesAndMortuariesMember" xlink:label="loc_snfcCemeteriesAndMortuariesMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcRestrictedAssetsDomain" xlink:to="loc_snfcCemeteriesAndMortuariesMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetInvestmentIncome" xlink:label="loc_us-gaapNetInvestmentIncome_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNetInvestmentIncome_70" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SecuritiesOnDepositForRegulatoryAuthorities" xlink:label="loc_snfcSecuritiesOnDepositForRegulatoryAuthorities_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSecuritiesOnDepositForRegulatoryAuthorities_70" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsCommercialRealEstateHeldForInvestmentDetails" xlink:title="00000042 - Disclosure - 3) Investments: Commercial Real Estate Held for Investment (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaapInvestmentTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapInvestmentTypeAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CommercialRealEstate1Member" xlink:label="loc_snfcCommercialRealEstate1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentTypeCategorizationMember" xlink:to="loc_snfcCommercialRealEstate1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateGrossAtCarryingValue" xlink:label="loc_us-gaapRealEstateGrossAtCarryingValue_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateGrossAtCarryingValue_70" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansPayableToBank" xlink:label="loc_us-gaapLoansPayableToBank_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLoansPayableToBank_70" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ImpairmentLossesOnCommercialRealEstateHeldForSale" xlink:label="loc_snfcImpairmentLossesOnCommercialRealEstateHeldForSale_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcImpairmentLossesOnCommercialRealEstateHeldForSale_70" xlink:type="arc" order="2" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsCommercialRealEstateInvestmentDetails" xlink:title="00000043 - Disclosure - 3) Investments: Commercial Real Estate Investment (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srtStatementGeographicalAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtStatementGeographicalAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ArizonaMember" xlink:label="loc_snfcArizonaMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcArizonaMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_KansasMember" xlink:label="loc_snfcKansasMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcKansasMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NevadaMember" xlink:label="loc_snfcNevadaMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcNevadaMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TexasMember" xlink:label="loc_snfcTexasMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcTexasMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LouisianaMember" xlink:label="loc_snfcLouisianaMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcLouisianaMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MississippiMember" xlink:label="loc_snfcMississippiMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcMississippiMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_UtahMember" xlink:label="loc_snfcUtahMember_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcUtahMember_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaapInvestmentTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapInvestmentTypeAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CommercialRealEstate1Member" xlink:label="loc_snfcCommercialRealEstate1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentTypeCategorizationMember" xlink:to="loc_snfcCommercialRealEstate1Member_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyNet" xlink:label="loc_us-gaapRealEstateInvestmentPropertyNet_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateInvestmentPropertyNet_170" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TotalSquareFootage" xlink:label="loc_snfcTotalSquareFootage_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcTotalSquareFootage_170" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateHeldforsale" xlink:label="loc_us-gaapRealEstateHeldforsale_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateHeldforsale_170" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SquareFootage" xlink:label="loc_snfcSquareFootage_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSquareFootage_170" xlink:type="arc" order="3" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsResidentialRealEstateHeldForInvestmentDetails" xlink:title="00000044 - Disclosure - 3) Investments: Residential Real Estate Held for Investment (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaapInvestmentTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapInvestmentTypeAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialRealEstate1Member" xlink:label="loc_snfcResidentialRealEstate1Member_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentTypeCategorizationMember" xlink:to="loc_snfcResidentialRealEstate1Member_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ForeclosedResidentialRealEstateIncludedInResidentialRealEstateHeldForInvestment" xlink:label="loc_snfcForeclosedResidentialRealEstateIncludedInResidentialRealEstateHeldForInvestment_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcForeclosedResidentialRealEstateIncludedInResidentialRealEstateHeldForInvestment_50" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ImpairmentLossesOnResidentialRealEstateHeldForInvestment" xlink:label="loc_snfcImpairmentLossesOnResidentialRealEstateHeldForInvestment_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcImpairmentLossesOnResidentialRealEstateHeldForInvestment_50" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsResidentialRealEstateInvestmentDetails" xlink:title="00000045 - Disclosure - 3) Investments: Residential Real Estate Investment (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srtStatementGeographicalAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtStatementGeographicalAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CaliforniaMember" xlink:label="loc_snfcCaliforniaMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcCaliforniaMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FloridaMember" xlink:label="loc_snfcFloridaMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcFloridaMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NevadaMember" xlink:label="loc_snfcNevadaMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcNevadaMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_OhioMember" xlink:label="loc_snfcOhioMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcOhioMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_UtahMember" xlink:label="loc_snfcUtahMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcUtahMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_WashingtonMember" xlink:label="loc_snfcWashingtonMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_snfcWashingtonMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaapInvestmentTypeAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapInvestmentTypeAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaapInvestmentTypeCategorizationMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapInvestmentTypeAxis" xlink:to="loc_us-gaapInvestmentTypeCategorizationMember_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialRealEstate1Member" xlink:label="loc_snfcResidentialRealEstate1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapInvestmentTypeCategorizationMember" xlink:to="loc_snfcResidentialRealEstate1Member_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateInvestmentPropertyNet" xlink:label="loc_us-gaapRealEstateInvestmentPropertyNet_150" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateInvestmentPropertyNet_150" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RealEstateHeldforsale" xlink:label="loc_us-gaapRealEstateHeldforsale_150" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapRealEstateHeldforsale_150" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsRealEstateOwnedAndOccupiedByCompanyDetails" xlink:title="00000046 - Disclosure - 3) Investments: Real Estate Owned and Occupied by the Company (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaapStatementBusinessSegmentsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementBusinessSegmentsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CorporateOfficesLifeInsuranceAndCemeteryMortuaryOperationsMember" xlink:label="loc_snfcCorporateOfficesLifeInsuranceAndCemeteryMortuaryOperationsMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcCorporateOfficesLifeInsuranceAndCemeteryMortuaryOperationsMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageMember" xlink:label="loc_snfcMortgageMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcMortgageMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LifeInsuranceOperationsMember" xlink:label="loc_snfcLifeInsuranceOperationsMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcLifeInsuranceOperationsMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LifeInsuranceOperations1Member" xlink:label="loc_snfcLifeInsuranceOperations1Member_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcLifeInsuranceOperations1Member_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageSalesMember" xlink:label="loc_snfcMortgageSalesMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcMortgageSalesMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageSales1Member" xlink:label="loc_snfcMortgageSales1Member_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcMortgageSales1Member_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageSales2Member" xlink:label="loc_snfcMortgageSales2Member_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcMortgageSales2Member_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ApproximateSquareFootage" xlink:label="loc_snfcApproximateSquareFootage_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcApproximateSquareFootage_80" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SquareFootageOccupiedByTheCompany" xlink:label="loc_snfcSquareFootageOccupiedByTheCompany_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSquareFootageOccupiedByTheCompany_80" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsScheduleOfAllowanceForLoanLossesAsContra-assetAccountDetails" xlink:title="00000047 - Disclosure - 3) Investments: Schedule of Allowance for loan losses as a contra-asset account (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialLoanMember" xlink:label="loc_us-gaapCommercialLoanMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapCommercialLoanMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaapResidentialMortgageMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapResidentialMortgageMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialConstructionMember" xlink:label="loc_snfcResidentialConstructionMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcResidentialConstructionMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses" xlink:label="loc_us-gaapFinancingReceivableAllowanceForCreditLosses_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinancingReceivableAllowanceForCreditLosses_170" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AllowanceForCreditLossesChargeOffs" xlink:label="loc_snfcAllowanceForCreditLossesChargeOffs_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAllowanceForCreditLossesChargeOffs_170" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AllowanceForCreditLossesProvision" xlink:label="loc_snfcAllowanceForCreditLossesProvision_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAllowanceForCreditLossesProvision_170" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1" xlink:label="loc_us-gaapFinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_170" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment" xlink:label="loc_us-gaapFinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment_170" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoans" xlink:label="loc_snfcMortgageLoans_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoans_170" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment" xlink:label="loc_us-gaapFinancingReceivableIndividuallyEvaluatedForImpairment_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinancingReceivableIndividuallyEvaluatedForImpairment_170" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment" xlink:label="loc_us-gaapFinancingReceivableCollectivelyEvaluatedForImpairment_170" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinancingReceivableCollectivelyEvaluatedForImpairment_170" xlink:type="arc" order="8" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/InvestmentsScheduleOfAgingOfMortgageLoansDetails" xlink:title="00000048 - Disclosure - 3) Investments: Schedule of aging of mortgage loans (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialLoanMember" xlink:label="loc_us-gaapCommercialLoanMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapCommercialLoanMember_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaapResidentialMortgageMember_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapResidentialMortgageMember_80" xlink:type="arc" order="82" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialConstructionMember" xlink:label="loc_snfcResidentialConstructionMember_160" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcResidentialConstructionMember_160" xlink:type="arc" order="162" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AgingOfLoansAxis" xlink:label="loc_snfcAgingOfLoansAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcAgingOfLoansAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AgingOfLoansDomain" xlink:label="loc_snfcAgingOfLoansDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcAgingOfLoansAxis" xlink:to="loc_snfcAgingOfLoansDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AgingOfLoansDomain" xlink:label="loc_snfcAgingOfLoansDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcAgingOfLoansAxis" xlink:to="loc_snfcAgingOfLoansDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PastDue30To59DaysMember" xlink:label="loc_snfcPastDue30To59DaysMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcAgingOfLoansDomain" xlink:to="loc_snfcPastDue30To59DaysMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PastDue60To89DaysMember" xlink:label="loc_snfcPastDue60To89DaysMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcAgingOfLoansDomain" xlink:to="loc_snfcPastDue60To89DaysMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PastDue90OrMoreDaysMember" xlink:label="loc_snfcPastDue90OrMoreDaysMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcAgingOfLoansDomain" xlink:to="loc_snfcPastDue90OrMoreDaysMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_InForeclosureMember" xlink:label="loc_snfcInForeclosureMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcAgingOfLoansDomain" xlink:to="loc_snfcInForeclosureMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TotalPastDueMember" xlink:label="loc_snfcTotalPastDueMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcAgingOfLoansDomain" xlink:to="loc_snfcTotalPastDueMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CurrentMember" xlink:label="loc_snfcCurrentMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcAgingOfLoansDomain" xlink:to="loc_snfcCurrentMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetMortgageLoansMember" xlink:label="loc_snfcNetMortgageLoansMember_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcAgingOfLoansDomain" xlink:to="loc_snfcNetMortgageLoansMember_70" xlink:type="arc" order="71" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansDuringPeriod" xlink:label="loc_snfcMortgageLoansDuringPeriod_620" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansDuringPeriod_620" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansAllowanceForLoanLosses" xlink:label="loc_snfcMortgageLoansAllowanceForLoanLosses_620" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansAllowanceForLoanLosses_620" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansUnamortizedDeferredLoanFeesNet" xlink:label="loc_snfcMortgageLoansUnamortizedDeferredLoanFeesNet_620" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansUnamortizedDeferredLoanFeesNet_620" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansUnamortizedDiscountsNet" xlink:label="loc_snfcMortgageLoansUnamortizedDiscountsNet_620" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoansUnamortizedDiscountsNet_620" xlink:type="arc" order="3" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfImpairedMortgageLoansDetails" xlink:title="00000049 - Disclosure - 3) Investments: Schedule of Impaired Mortgage Loans (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialLoanMember" xlink:label="loc_us-gaapCommercialLoanMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapCommercialLoanMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaapResidentialMortgageMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapResidentialMortgageMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialConstructionMember" xlink:label="loc_snfcResidentialConstructionMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcResidentialConstructionMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationAxis" xlink:label="loc_snfcTimeDurationAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcTimeDurationAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationDomain" xlink:label="loc_snfcTimeDurationDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcTimeDurationAxis" xlink:to="loc_snfcTimeDurationDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimeDurationDomain" xlink:label="loc_snfcTimeDurationDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcTimeDurationAxis" xlink:to="loc_snfcTimeDurationDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TotalMember" xlink:label="loc_snfcTotalMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcTimeDurationDomain" xlink:to="loc_snfcTotalMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_250" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance" xlink:label="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance_250" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ImpairedFinancingReceivableWithNoRelatedAllowance" xlink:label="loc_snfcImpairedFinancingReceivableWithNoRelatedAllowance_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcImpairedFinancingReceivableWithNoRelatedAllowance_250" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment" xlink:label="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment_250" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod" xlink:label="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod_250" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_250" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance" xlink:label="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance_250" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableRelatedAllowance" xlink:label="loc_us-gaapImpairedFinancingReceivableRelatedAllowance_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableRelatedAllowance_250" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment" xlink:label="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment_250" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod" xlink:label="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod_250" xlink:type="arc" order="9" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfCreditRiskOfMortgageLoansBasedOnPerformanceStatusDetails" xlink:title="00000050 - Disclosure - 3) Investments: Schedule Of Credit Risk Of Mortgage Loans Based On Performance Status (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CreditQualityIndicatorAxis" xlink:label="loc_snfcCreditQualityIndicatorAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcCreditQualityIndicatorAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CreditQualityIndicatorDomain" xlink:label="loc_snfcCreditQualityIndicatorDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcCreditQualityIndicatorAxis" xlink:to="loc_snfcCreditQualityIndicatorDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CreditQualityIndicatorDomain" xlink:label="loc_snfcCreditQualityIndicatorDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcCreditQualityIndicatorAxis" xlink:to="loc_snfcCreditQualityIndicatorDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PerformingFinancingReceivable1Member" xlink:label="loc_snfcPerformingFinancingReceivable1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcCreditQualityIndicatorDomain" xlink:to="loc_snfcPerformingFinancingReceivable1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NonperformingFinancingReceivable1Member" xlink:label="loc_snfcNonperformingFinancingReceivable1Member_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcCreditQualityIndicatorDomain" xlink:to="loc_snfcNonperformingFinancingReceivable1Member_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialLoanMember" xlink:label="loc_us-gaapCommercialLoanMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapCommercialLoanMember_0" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaapResidentialMortgageMember_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapResidentialMortgageMember_60" xlink:type="arc" order="62" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialConstructionMember" xlink:label="loc_snfcResidentialConstructionMember_120" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcResidentialConstructionMember_120" xlink:type="arc" order="122" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoans" xlink:label="loc_snfcMortgageLoans_250" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageLoans_250" xlink:type="arc" order="0" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsSummaryOfInterestNotAccruedOnNonPerformingMortgageLoansDetails" xlink:title="00000051 - Disclosure - 3) Investments: Summary of Interest not accrued on non-performing mortgage loans (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure3InvestmentsScheduleOfMortgageLoansOnANonaccrualStatusDetails" xlink:title="00000052 - Disclosure - 3) Investments: Schedule of Mortgage loans on a nonaccrual status (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CommercialMember" xlink:label="loc_snfcCommercialMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcCommercialMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaapResidentialMortgageMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapResidentialMortgageMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialConstructionMember" xlink:label="loc_snfcResidentialConstructionMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcResidentialConstructionMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest" xlink:label="loc_us-gaapLoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest_90" xlink:type="arc" order="0" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSaleAggregateFairValueLoansHeldForSaleDetails" xlink:title="00000053 - Disclosure - 4) Loans Held For Sale: Aggregate fair value - Loans Held for Sale (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSaleScheduleOfMortgageFeeIncomeForLoansHeldForSaleDetails" xlink:title="00000054 - Disclosure - 4) Loans Held For Sale: Schedule of Mortgage Fee Income for Loans Held for Sale (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LoansHeldForSale1Member" xlink:label="loc_snfcLoansHeldForSale1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcLoansHeldForSale1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LoanFees" xlink:label="loc_snfcLoanFees_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcLoanFees_50" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndOtherIncome" xlink:label="loc_us-gaapInterestAndOtherIncome_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapInterestAndOtherIncome_50" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SecondaryGains" xlink:label="loc_snfcSecondaryGains_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSecondaryGains_50" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ChangeInFairValueOfLoanCommitments" xlink:label="loc_snfcChangeInFairValueOfLoanCommitments_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcChangeInFairValueOfLoanCommitments_50" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ChangeInFairValueOfLoanHeldForSale" xlink:label="loc_snfcChangeInFairValueOfLoanHeldForSale_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcChangeInFairValueOfLoanHeldForSale_50" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForLoanAndLeaseLosses" xlink:label="loc_us-gaapProvisionForLoanAndLeaseLosses_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapProvisionForLoanAndLeaseLosses_50" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageFeeIncome" xlink:label="loc_snfcMortgageFeeIncome_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcMortgageFeeIncome_50" xlink:type="arc" order="6" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure4LoansHeldForSaleScheduleOfLoanLossReserveWhichIsIncludedInOtherLiabilitiesAndAccruedExpensesDetails" xlink:title="00000055 - Disclosure - 4) Loans Held For Sale: Schedule of loan loss reserve which is included in other liabilities and accrued expenses (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure5StockBasedCompensationDetails" xlink:title="00000056 - Disclosure - 5) Stock-based Compensation (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure5StockBasedCompensationScheduleOfStockInventivePlanChangesDetails" xlink:title="00000057 - Disclosure - 5) Stock-based Compensation: Schedule of stock inventive plan changes (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="loc_us-gaapCommonClassAMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassAMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassCMember" xlink:label="loc_us-gaapCommonClassCMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_us-gaapCommonClassCMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaapSharesOutstanding_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharesOutstanding_130" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_130" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AdjustmentForEffectOfStockDividends" xlink:label="loc_snfcAdjustmentForEffectOfStockDividends_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAdjustmentForEffectOfStockDividends_130" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SharesGranted" xlink:label="loc_snfcSharesGranted_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSharesGranted_130" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PerShareSharesGranted" xlink:label="loc_snfcPerShareSharesGranted_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcPerShareSharesGranted_130" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SharesExercised" xlink:label="loc_snfcSharesExercised_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSharesExercised_130" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PerShareSharesExercised" xlink:label="loc_snfcPerShareSharesExercised_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcPerShareSharesExercised_130" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SharesCancelled" xlink:label="loc_snfcSharesCancelled_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSharesCancelled_130" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PerShareSharesCancelled" xlink:label="loc_snfcPerShareSharesCancelled_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcPerShareSharesCancelled_130" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_OptionsExercisable" xlink:label="loc_snfcOptionsExercisable_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcOptionsExercisable_130" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_130" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AvailableOptionsForFutureGrant" xlink:label="loc_snfcAvailableOptionsForFutureGrant_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAvailableOptionsForFutureGrant_130" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_WeightedAverageContractualTermOfOptionsoutstanding" xlink:label="loc_snfcWeightedAverageContractualTermOfOptionsoutstanding_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcWeightedAverageContractualTermOfOptionsoutstanding_130" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_WeightedAverageContractualTermOfOptionsexercisable" xlink:label="loc_snfcWeightedAverageContractualTermOfOptionsexercisable_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcWeightedAverageContractualTermOfOptionsexercisable_130" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AggregatedIntrinsicValueOfOptionsOutstanding" xlink:label="loc_snfcAggregatedIntrinsicValueOfOptionsOutstanding_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAggregatedIntrinsicValueOfOptionsOutstanding_130" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AggregatedIntrinsicValueOfOptionsExercisable" xlink:label="loc_snfcAggregatedIntrinsicValueOfOptionsExercisable_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAggregatedIntrinsicValueOfOptionsExercisable_130" xlink:type="arc" order="15" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure6EarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" xlink:title="00000058 - Disclosure - 6) Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure6EarningsPerShareDetails" xlink:title="00000059 - Disclosure - 6) Earnings Per Share (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/BusinessSegmentsInformationScheduleOfRevenuesAndExpensesByReportableSegmentDetails" xlink:title="00000060 - Disclosure - 7) Business Segments Information : Schedule of Revenues and Expenses by Reportable Segment (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaapStatementBusinessSegmentsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementBusinessSegmentsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LifeInsuranceSegmentMember" xlink:label="loc_us-gaapLifeInsuranceSegmentMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_us-gaapLifeInsuranceSegmentMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteryAndMortuaryMember" xlink:label="loc_snfcCemeteryAndMortuaryMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcCemeteryAndMortuaryMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageMember" xlink:label="loc_snfcMortgageMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcMortgageMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_IntercompanyEliminationsMember" xlink:label="loc_snfcIntercompanyEliminationsMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcIntercompanyEliminationsMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RevenueFromCustomers" xlink:label="loc_snfcRevenueFromCustomers_310" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcRevenueFromCustomers_310" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SegmentReportingInformationIntersegmentRevenue1" xlink:label="loc_snfcSegmentReportingInformationIntersegmentRevenue1_310" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSegmentReportingInformationIntersegmentRevenue1_310" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_SegmentReportingInformationIncomeLossBeforeIncomeTaxes1" xlink:label="loc_snfcSegmentReportingInformationIncomeLossBeforeIncomeTaxes1_310" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSegmentReportingInformationIncomeLossBeforeIncomeTaxes1_310" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_IdentifiableAssets" xlink:label="loc_snfcIdentifiableAssets_310" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcIdentifiableAssets_310" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaapGoodwill_310" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapGoodwill_310" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets_310" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAssets_310" xlink:type="arc" order="5" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstrumentsScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisDetails" xlink:title="00000061 - Disclosure - 8) Fair Value of Financial Instruments: Schedule of fair value assets and liabilities measured on a recurring basis (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaapFairValueInputsLevel1Member_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel1Member_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaapFairValueInputsLevel2Member_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel2Member_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel3Member_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TradingSecuritiesEquity" xlink:label="loc_us-gaapTradingSecuritiesEquity_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapTradingSecuritiesEquity_90" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaapAvailableForSaleSecurities_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAvailableForSaleSecurities_90" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure" xlink:label="loc_us-gaapLoansHeldForSaleFairValueDisclosure_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLoansHeldForSaleFairValueDisclosure_90" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RestrictedAssetsOfCemeteriesAndMortuaries" xlink:label="loc_snfcRestrictedAssetsOfCemeteriesAndMortuaries_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcRestrictedAssetsOfCemeteriesAndMortuaries_90" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RestrictedAssetsOfCemeteriesAndMortuaries1" xlink:label="loc_snfcRestrictedAssetsOfCemeteriesAndMortuaries1_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcRestrictedAssetsOfCemeteriesAndMortuaries1_90" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteryPerpetualCareTrustInvestments1" xlink:label="loc_snfcCemeteryPerpetualCareTrustInvestments1_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcCemeteryPerpetualCareTrustInvestments1_90" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteryPerpetualCareTrustInvestments2" xlink:label="loc_snfcCemeteryPerpetualCareTrustInvestments2_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcCemeteryPerpetualCareTrustInvestments2_90" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DerivativesInterestRateLockCommitments" xlink:label="loc_snfcDerivativesInterestRateLockCommitments_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcDerivativesInterestRateLockCommitments_90" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AssetsFairValueDisclosureRecurring1" xlink:label="loc_snfcAssetsFairValueDisclosureRecurring1_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAssetsFairValueDisclosureRecurring1_90" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DerivativesBankLoanInterestRateSwapsCallOptions" xlink:label="loc_snfcDerivativesBankLoanInterestRateSwapsCallOptions_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcDerivativesBankLoanInterestRateSwapsCallOptions_90" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DerivativesBankLoanInterestRateSwapsPutOptions" xlink:label="loc_snfcDerivativesBankLoanInterestRateSwapsPutOptions_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcDerivativesBankLoanInterestRateSwapsPutOptions_90" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_DerivativesBankLoanInterestRateSwapsInterestRateLockCommitments" xlink:label="loc_snfcDerivativesBankLoanInterestRateSwapsInterestRateLockCommitments_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcDerivativesBankLoanInterestRateSwapsInterestRateLockCommitments_90" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations" xlink:label="loc_us-gaapFairValueLiabilitiesMeasuredOnRecurringBasisObligations_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFairValueLiabilitiesMeasuredOnRecurringBasisObligations_90" xlink:type="arc" order="12" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20191231/role/idr_Disclosure17FairValueOfFinancialInstrumentsScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsDetails" xlink:title="00000062 - Disclosure - 8) Fair Value of Financial Instruments: Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsAxis" xlink:label="loc_snfcLevel3InputsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcLevel3InputsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsDomain" xlink:label="loc_snfcLevel3InputsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcLevel3InputsAxis" xlink:to="loc_snfcLevel3InputsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsDomain" xlink:label="loc_snfcLevel3InputsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcLevel3InputsAxis" xlink:to="loc_snfcLevel3InputsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LoansHeldForSale1Member" xlink:label="loc_snfcLoansHeldForSale1Member_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcLoansHeldForSale1Member_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetDerivativesLoanCommitmentsMember" xlink:label="loc_snfcNetDerivativesLoanCommitmentsMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcNetDerivativesLoanCommitmentsMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FixedMaturitySecuritiesAvailableForSale1Member" xlink:label="loc_snfcFixedMaturitySecuritiesAvailableForSale1Member_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcFixedMaturitySecuritiesAvailableForSale1Member_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FairValueBalance" xlink:label="loc_snfcFairValueBalance_120" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFairValueBalance_120" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityRangeOfInputsMinimum" xlink:label="loc_snfcFairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityRangeOfInputsMinimum_120" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityRangeOfInputsMinimum_120" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityRangeOfInputsMaximum" xlink:label="loc_snfcFairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityRangeOfInputsMaximum_120" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityRangeOfInputsMaximum_120" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityWeightedAverage" xlink:label="loc_snfcFairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityWeightedAverage_120" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityWeightedAverage_120" xlink:type="arc" order="3" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstrumentsScheduleOfChangesInTheConsolidatedBalanceSheetLineItemsMeasuredUsingLevel3InputsDetails" xlink:title="00000063 - Disclosure - 8) Fair Value of Financial Instruments: Schedule of Changes in the consolidated balance sheet line items measured using level 3 inputs (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsAxis" xlink:label="loc_snfcLevel3InputsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcLevel3InputsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsDomain" xlink:label="loc_snfcLevel3InputsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcLevel3InputsAxis" xlink:to="loc_snfcLevel3InputsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsDomain" xlink:label="loc_snfcLevel3InputsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcLevel3InputsAxis" xlink:to="loc_snfcLevel3InputsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetDerivativesLoanCommitmentsMember" xlink:label="loc_snfcNetDerivativesLoanCommitmentsMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcNetDerivativesLoanCommitmentsMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LoansHeldForSale1Member" xlink:label="loc_snfcLoansHeldForSale1Member_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcLoansHeldForSale1Member_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FixedMaturitySecuritiesAvailableForSale1Member" xlink:label="loc_snfcFixedMaturitySecuritiesAvailableForSale1Member_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcFixedMaturitySecuritiesAvailableForSale1Member_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FairValueBalance" xlink:label="loc_snfcFairValueBalance_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFairValueBalance_70" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Originations" xlink:label="loc_snfcOriginations_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcOriginations_70" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Sales" xlink:label="loc_snfcSales_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcSales_70" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TransferToMortgageLoansHeldForInvestment" xlink:label="loc_snfcTransferToMortgageLoansHeldForInvestment_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcTransferToMortgageLoansHeldForInvestment_70" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TransferFromFixedMaturitySecuritiesHeldToMaturity" xlink:label="loc_snfcTransferFromFixedMaturitySecuritiesHeldToMaturity_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcTransferFromFixedMaturitySecuritiesHeldToMaturity_70" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FairValueLossesGainsIncludedInEarnings" xlink:label="loc_snfcFairValueLossesGainsIncludedInEarnings_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFairValueLossesGainsIncludedInEarnings_70" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TotalGainsLossesIncludedInOtherComprehensiveIncome" xlink:label="loc_snfcTotalGainsLossesIncludedInOtherComprehensiveIncome_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcTotalGainsLossesIncludedInOtherComprehensiveIncome_70" xlink:type="arc" order="6" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure8FairValueOfFinancialInstrumentsFairValueAssetsMeasuredOnANonrecurringBasisDetails" xlink:title="00000064 - Disclosure - 8) Fair Value of Financial Instruments: Fair Value Assets Measured on a Nonrecurring Basis (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaapFairValueInputsLevel1Member_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel1Member_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaapFairValueInputsLevel2Member_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel2Member_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel3Member_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MortgageLoansOnRealEstate" xlink:label="loc_us-gaapMortgageLoansOnRealEstate_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapMortgageLoansOnRealEstate_90" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ImpairedRealEstateHeldForInvestment" xlink:label="loc_snfcImpairedRealEstateHeldForInvestment_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcImpairedRealEstateHeldForInvestment_90" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_AssetsFairValueDisclosureNonrecurring2" xlink:label="loc_snfcAssetsFairValueDisclosureNonrecurring2_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcAssetsFairValueDisclosureNonrecurring2_90" xlink:type="arc" order="2" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/FairValueOfFinancialInstrumentsScheduleOfFinancialInstrumentsCarriedAtOtherThanFairValueDetails" xlink:title="00000065 - Disclosure - 8) Fair Value of Financial Instruments: Schedule of Financial Instruments Carried at Other Than Fair Value (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaapFairValueInputsLevel1Member_120" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel1Member_120" xlink:type="arc" order="121" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaapFairValueInputsLevel2Member_240" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel2Member_240" xlink:type="arc" order="241" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_360" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel3Member_360" xlink:type="arc" order="361" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaapFinancialInstrumentAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapFinancialInstrumentAxis" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFinancialInstrumentAxis" xlink:to="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResidentialMortgageMember" xlink:label="loc_us-gaapResidentialMortgageMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapResidentialMortgageMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ResidentialConstructionMember" xlink:label="loc_snfcResidentialConstructionMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcResidentialConstructionMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialLoanMember" xlink:label="loc_us-gaapCommercialLoanMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapCommercialLoanMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageLoansNet1Member" xlink:label="loc_snfcMortgageLoansNet1Member_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcMortgageLoansNet1Member_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PolicyLoanMember" xlink:label="loc_snfcPolicyLoanMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcPolicyLoanMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_InsuranceAssignmentsMember" xlink:label="loc_snfcInsuranceAssignmentsMember_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcInsuranceAssignmentsMember_50" xlink:type="arc" order="51" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RestrictedAssets1Member" xlink:label="loc_snfcRestrictedAssets1Member_60" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcRestrictedAssets1Member_60" xlink:type="arc" order="61" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteryPerpetualCareTrustInvestments2Member" xlink:label="loc_snfcCemeteryPerpetualCareTrustInvestments2Member_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcCemeteryPerpetualCareTrustInvestments2Member_70" xlink:type="arc" order="71" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MortgageServicingRightsMember" xlink:label="loc_snfcMortgageServicingRightsMember_80" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcMortgageServicingRightsMember_80" xlink:type="arc" order="81" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BankAndOtherLoansPayableMember" xlink:label="loc_snfcBankAndOtherLoansPayableMember_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcBankAndOtherLoansPayableMember_90" xlink:type="arc" order="91" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PolicyholderAccountBalancesMember" xlink:label="loc_snfcPolicyholderAccountBalancesMember_100" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcPolicyholderAccountBalancesMember_100" xlink:type="arc" order="101" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FuturePolicyBenefitsAnnuitiesMember" xlink:label="loc_snfcFuturePolicyBenefitsAnnuitiesMember_110" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_snfcFuturePolicyBenefitsAnnuitiesMember_110" xlink:type="arc" order="111" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_370" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapTransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="loc_us-gaapFairValueInputsLevel3Member_370" xlink:type="arc" order="372" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CarryingValue" xlink:label="loc_snfcCarryingValue_970" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcCarryingValue_970" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_EstimatedCarryingValue" xlink:label="loc_snfcEstimatedCarryingValue_970" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcEstimatedCarryingValue_970" xlink:type="arc" order="1" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/DerivativeInstrumentsScheduleOfDerivativeAssetsAtFairValueDetails" xlink:title="00000066 - Disclosure - 10) Derivative Instruments: Schedule of Derivative Assets at Fair Value (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsAxis" xlink:label="loc_snfcLevel3InputsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcLevel3InputsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsDomain" xlink:label="loc_snfcLevel3InputsDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcLevel3InputsAxis" xlink:to="loc_snfcLevel3InputsDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_Level3InputsDomain" xlink:label="loc_snfcLevel3InputsDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcLevel3InputsAxis" xlink:to="loc_snfcLevel3InputsDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LoanCommitmentsMember" xlink:label="loc_snfcLoanCommitmentsMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcLoanCommitmentsMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CallOptionsMember" xlink:label="loc_snfcCallOptionsMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcCallOptionsMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_PutOptionsMember" xlink:label="loc_snfcPutOptionsMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcPutOptionsMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetDerivativesLoanCommitmentsMember" xlink:label="loc_snfcNetDerivativesLoanCommitmentsMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcLevel3InputsDomain" xlink:to="loc_snfcNetDerivativesLoanCommitmentsMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeNotionalAmount" xlink:label="loc_us-gaapDerivativeNotionalAmount_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDerivativeNotionalAmount_90" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetNotionalAmount" xlink:label="loc_us-gaapDerivativeAssetNotionalAmount_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDerivativeAssetNotionalAmount_90" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityNotionalAmount" xlink:label="loc_us-gaapDerivativeLiabilityNotionalAmount_90" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDerivativeLiabilityNotionalAmount_90" xlink:type="arc" order="2" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/DerivativeInstrumentsScheduleOfGainsAndLossesOnDerivativesDetails" xlink:title="00000067 - Disclosure - 10) Derivative Instruments: Schedule of Gains and Losses on Derivatives (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure11ReinsuranceCommitmentsAndContingenciesMortgageLoanLossSettlementsDetails" xlink:title="00000068 - Disclosure - 11) Reinsurance, Commitments and Contingencies: Mortgage Loan Loss Settlements (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure11ReinsuranceCommitmentsAndContingenciesOtherContingenciesAndCommitmentsDetails" xlink:title="00000069 - Disclosure - 11) Reinsurance, Commitments and Contingencies: Other Contingencies and Commitments (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsScheduleOfMortgageServicingRightsDetails" xlink:title="00000070 - Disclosure - 12) Mortgage Servicing Rights: Schedule of Mortgage Servicing Rights (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsScheduleOfFiniteLivedIntangibleAssetsFutureAmortizationExpenseMortgageServicingRightsDetails" xlink:title="00000071 - Disclosure - 12) Mortgage Servicing Rights: Schedule of Finite-Lived Intangible Assets, Future Amortization Expense, Mortgage Servicing Rights (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsScheduleOfOtherRevenuesDetails" xlink:title="00000072 - Disclosure - 12) Mortgage Servicing Rights: Schedule of Other Revenues (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srtProductOrServiceAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtProductOrServiceAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ContractualServicingFeesMember" xlink:label="loc_snfcContractualServicingFeesMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_snfcContractualServicingFeesMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_LateFeesMember" xlink:label="loc_snfcLateFeesMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_snfcLateFeesMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncome" xlink:label="loc_us-gaapOtherIncome_130" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOtherIncome_130" xlink:type="arc" order="0" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure12MortgageServicingRightsSummaryOfUnpaidPrincipalBalancesOfTheServicingPortfolioDetails" xlink:title="00000073 - Disclosure - 12) Mortgage Servicing Rights: Summary of Unpaid Principal Balances of the Servicing Portfolio (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/MortgageServicingRightsAssumptionsUsedInDeterminingMsrValueDetails" xlink:title="00000074 - Disclosure - 12) Mortgage Servicing Rights: Assumptions used in determining MSR value (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure13IncomeTaxesDetails" xlink:title="00000075 - Disclosure - 13) Income Taxes (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/RevenuesFromContractsWithCustomersScheduleOfOpeningAndClosingBalancesOfReceivablesContractAssetsAndContractLiabilitiesDetails" xlink:title="00000076 - Disclosure - 14) Revenues From Contracts With Customers: Schedule of Opening and Closing Balances of Receivables, Contract Assets and Contract Liabilities (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ReceivablesContractAssetsAndContractLiabilitiesAxis" xlink:label="loc_snfcReceivablesContractAssetsAndContractLiabilitiesAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_snfcReceivablesContractAssetsAndContractLiabilitiesAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ReceivablesContractAssetsAndContractLiabilitiesDomain" xlink:label="loc_snfcReceivablesContractAssetsAndContractLiabilitiesDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_snfcReceivablesContractAssetsAndContractLiabilitiesAxis" xlink:to="loc_snfcReceivablesContractAssetsAndContractLiabilitiesDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ReceivablesContractAssetsAndContractLiabilitiesDomain" xlink:label="loc_snfcReceivablesContractAssetsAndContractLiabilitiesDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_snfcReceivablesContractAssetsAndContractLiabilitiesAxis" xlink:to="loc_snfcReceivablesContractAssetsAndContractLiabilitiesDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ReceivablesMember" xlink:label="loc_snfcReceivablesMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcReceivablesContractAssetsAndContractLiabilitiesDomain" xlink:to="loc_snfcReceivablesMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ContractAssetMember" xlink:label="loc_snfcContractAssetMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcReceivablesContractAssetsAndContractLiabilitiesDomain" xlink:to="loc_snfcContractAssetMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ContractLiabilityMember" xlink:label="loc_snfcContractLiabilityMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_snfcReceivablesContractAssetsAndContractLiabilitiesDomain" xlink:to="loc_snfcContractLiabilityMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNet" xlink:label="loc_us-gaapAccountsReceivableNet_160" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapAccountsReceivableNet_160" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredRevenue" xlink:label="loc_us-gaapDeferredRevenue_160" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDeferredRevenue_160" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaapIncreaseDecreaseInAccountsReceivable_160" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapIncreaseDecreaseInAccountsReceivable_160" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaapIncreaseDecreaseInDeferredRevenue_160" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapIncreaseDecreaseInDeferredRevenue_160" xlink:type="arc" order="3" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/RevenuesFromContractsWithCustomersDetails" xlink:title="00000077 - Disclosure - 14) Revenues From Contracts With Customers (Details)" />
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/RevenuesFromContractsWithCustomersRevenuesOfCemeteryAndMortuaryContractsDetails" xlink:title="00000078 - Disclosure - 14) Revenues From Contracts With Customers: Revenues of the Cemetery and Mortuary Contracts (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaapIncomeStatementLocationAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapIncomeStatementLocationAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MajorGoodsOrServicesLinesAtNeedMember" xlink:label="loc_snfcMajorGoodsOrServicesLinesAtNeedMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_snfcMajorGoodsOrServicesLinesAtNeedMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_MajorGoodsOrServicesLinesPreNeedMember" xlink:label="loc_snfcMajorGoodsOrServicesLinesPreNeedMember_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_snfcMajorGoodsOrServicesLinesPreNeedMember_10" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimingOfRevenueRecognitionGoodsTransferredAtAPointInTimeMember" xlink:label="loc_snfcTimingOfRevenueRecognitionGoodsTransferredAtAPointInTimeMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_snfcTimingOfRevenueRecognitionGoodsTransferredAtAPointInTimeMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_TimingOfRevenueRecognitionServicesTransferredAtAPointInTimeMember" xlink:label="loc_snfcTimingOfRevenueRecognitionServicesTransferredAtAPointInTimeMember_30" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_snfcTimingOfRevenueRecognitionServicesTransferredAtAPointInTimeMember_30" xlink:type="arc" order="31" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetMortuaryAndCemeterySales" xlink:label="loc_snfcNetMortuaryAndCemeterySales_210" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcNetMortuaryAndCemeterySales_210" xlink:type="arc" order="0" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/20190930/role/idr_Disclosure14RevenuesFromContractsWithCustomersReconciliationOfRevenuesFromCemeteryAndMortuaryContractsToBusinessSegmentInformationDetails" xlink:title="00000079 - Disclosure - 14) Revenues From Contracts With Customers: Reconciliation of Revenues from Cemetery and mortuary contracts to Business Segment Information (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaapStatementBusinessSegmentsAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementBusinessSegmentsAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaapSegmentDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementBusinessSegmentsAxis" xlink:to="loc_us-gaapSegmentDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CemeteryAndMortuaryMember" xlink:label="loc_snfcCemeteryAndMortuaryMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSegmentDomain" xlink:to="loc_snfcCemeteryAndMortuaryMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_NetMortuaryAndCemeterySales" xlink:label="loc_snfcNetMortuaryAndCemeterySales_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcNetMortuaryAndCemeterySales_50" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments" xlink:label="loc_us-gaapGainLossOnInvestmentsExcludingOtherThanTemporaryImpairments_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapGainLossOnInvestmentsExcludingOtherThanTemporaryImpairments_50" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetInvestmentIncome" xlink:label="loc_us-gaapNetInvestmentIncome_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNetInvestmentIncome_50" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_OtherRevenues" xlink:label="loc_snfcOtherRevenues_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcOtherRevenues_50" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_RevenuesFromExternalCustomers" xlink:label="loc_snfcRevenuesFromExternalCustomers_50" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcRevenuesFromExternalCustomers_50" xlink:type="arc" order="4" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://securitynational.com/role/AcquisitionsEstimatedFairValuesOfAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:title="00000080 - Disclosure - 15) Acquisitions: Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CoinsuranceAgreementMember" xlink:label="loc_snfcCoinsuranceAgreementMember_0" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_snfcCoinsuranceAgreementMember_0" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_ProbstFamilyFuneralsAndCremationsAndHeberValleyFuneralHomeMember" xlink:label="loc_snfcProbstFamilyFuneralsAndCremationsAndHeberValleyFuneralHomeMember_20" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_snfcProbstFamilyFuneralsAndCremationsAndHeberValleyFuneralHomeMember_20" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_KilpatrickLifeInsuranceCoMember" xlink:label="loc_snfcKilpatrickLifeInsuranceCoMember_40" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_snfcKilpatrickLifeInsuranceCoMember_40" xlink:type="arc" order="41" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherInvestmentsAndPolicyLoans" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherInvestmentsAndPolicyLoans_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherInvestmentsAndPolicyLoans_70" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRealEstateHeldForInvestment" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRealEstateHeldForInvestment_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRealEstateHeldForInvestment_70" xlink:type="arc" order="1" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMortgageLoansHeldForInvestment" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMortgageLoansHeldForInvestment_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMortgageLoansHeldForInvestment_70" xlink:type="arc" order="2" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFuturePolicyBenefitsAndUnpaidClaims" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFuturePolicyBenefitsAndUnpaidClaims_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFuturePolicyBenefitsAndUnpaidClaims_70" xlink:type="arc" order="3" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_CashReceivedForReinsuranceAssumed" xlink:label="loc_snfcCashReceivedForReinsuranceAssumed_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcCashReceivedForReinsuranceAssumed_70" xlink:type="arc" order="4" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFixedMaturitySecuritiesAvailableForSale" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFixedMaturitySecuritiesAvailableForSale_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFixedMaturitySecuritiesAvailableForSale_70" xlink:type="arc" order="5" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFixedMaturitySecuritiesHeldToMaturity" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFixedMaturitySecuritiesHeldToMaturity_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFixedMaturitySecuritiesHeldToMaturity_70" xlink:type="arc" order="6" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherInvestments" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherInvestments_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherInvestments_70" xlink:type="arc" order="7" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInvestmentIncome" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInvestmentIncome_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInvestmentIncome_70" xlink:type="arc" order="8" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestments" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestments_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestments_70" xlink:type="arc" order="9" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivablesFromReinsurers" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivablesFromReinsurers_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedReceivablesFromReinsurers_70" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_70" xlink:type="arc" order="11" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedValueOfBusinessAcquired" xlink:label="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedValueOfBusinessAcquired_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedValueOfBusinessAcquired_70" xlink:type="arc" order="12" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueOfAssetsAcquired" xlink:label="loc_us-gaapFairValueOfAssetsAcquired_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFairValueOfAssetsAcquired_70" xlink:type="arc" order="13" />
      <link:loc xlink:type="locator" xlink:href="snfc-20200630.xsd#snfc_FairValueOfAssetsAcquiredNetOfCash" xlink:label="loc_snfcFairValueOfAssetsAcquiredNetOfCash_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_snfcFairValueOfAssetsAcquiredNetOfCash_70" xlink:type="arc" order="14" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_70" xlink:type="arc" order="15" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_70" xlink:type="arc" order="16" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_70" xlink:type="arc" order="17" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_70" xlink:type="arc" order="18" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_70" xlink:type="arc" order="19" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_70" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_70" xlink:type="arc" order="21" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_70" xlink:type="arc" order="22" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_70" xlink:type="arc" order="23" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_70" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_70" xlink:type="arc" order="24" />
    </link:definitionLink>
</link:linkbase>
