siblings(Person, Sibling) :-
	false.

firstCousins(Person, Cousin) :-
	false.

hasAncestor(Person, Ancestor) :-
	false.

hasDescendant(Person, Descendant) :-
	true.

listAncestors(Person, Ancestors) :-
	false.

listDescendants(Person, Descendants) :-
	false.

hasHeir(Person, Heir) :-
	false.

hasSuccessor(Person, Successor) :-
	false.

heirIsSuccessor(Person) :-
	false.