father_of(joe, paul).
father_of(joe, mary).
father_of(joe, hope).
mother_of(jane, paul).
mother_of(jane, mary).
mother_of(jane, hope).
male(paul).
male(joe).
male(ralph).
male(X):-father_of(X, Y).
female(mary).
female(jane).
female(hope).
female(X):-mother_of(X, Y).
son_of(X, Y) :- father_of(Y, X), male(X).
son_of(X, Y) :- mother_of(Y, X), male(X).
daughter_of(X, Y) :- father_of(Y, X), female(X).
daughter_of(X, Y) :- mother_of(Y, X), female(X).
sibling_of(X, Y):-father_of(Z, X), father_of(Z, Y),X\=Y.
sibling_of(X, Y):-mother_of(Z, X), mother_of(Z, Y),X\=Y.
 

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