There is even CNLabelContactRelationElderCousinMothersSiblingsDaughterOrFathersSistersDaughter https://developer.apple.com/documentation/contacts/cnlabelconta

There is even CNLabelContactRelationElderCousinMothersSiblingsDaughterOrFathersSistersDaughter https://developer.apple.com/documentation/contacts/cnlabelcontactrelationeldercousinmotherssiblingsdaughterorfatherssistersdaughter https://developer.apple.com/documentation/contacts/cnlabelco...