getChildren method
Returns the children sorted by the birth year if available
Returns empty list if no children found
Implementation
List<IndividualElement?> getChildren(Map<String, GedcomElement> elementsMap) {
final childrenElements = <IndividualElement?>[];
final childrenIds =
children.where((element) => element.tag == GEDCOM_TAG_CHILD).toList();
for (final child in childrenIds) {
childrenElements.add(elementsMap[child.value!] as IndividualElement?);
}
childrenElements.sort();
return childrenElements;
}