getHusband method
Returns the husband/father of the family
Returns null if not found
Implementation
IndividualElement? getHusband(Map<String, GedcomElement> elementsMap) {
final husbandId = children
.firstWhereOrNull((element) => element.tag == GEDCOM_TAG_HUSBAND);
if (husbandId != null) {
final husband = elementsMap[husbandId.value!];
return husband as IndividualElement?;
}
return null;
}