Prolog家谱

当我询问兄弟,姐妹,叔叔,阿姨的时候,我做了但却没有显示答案

这是我写的,有什么不对？

/*uncle(X, Y) :– male(X), sibling(X, Z), parent(Z, Y).*/
/*uncle(X, Y) :– male(X), spouse(X, W), sibling(W, Z), parent(Z, Y).*/

uncle(X,Y) :-
  parent(Z,Y), brother(X,Z). 

aunt(X,Y) :-
  parent(Z,Y), sister(X,Z). 

sibling(X, Y) :-
      parent(Z, X),
      parent(Z, Y),
      X \= Y.

sister(X, Y) :-
      sibling(X, Y),
      female(X).

brother(X, Y) :-
      sibling(X, Y),
      male(X).

parent(Z,Y) :- father(Z,Y).
parent(Z,Y) :- mother(Z,Y).

grandparent(C,D) :- parent(C,E), parent(E,D).

aunt(X, Y) :– female(X), sibling(X, Z), parent(Z, Y).
aunt(X, Y) :– female(X), spouse(X, W), sibling(W, Z), parent(Z, Y).

male(john).
male(bob).
male(bill).
male(ron).
male(jeff).

female(mary).
female(sue).
female(nancy).

mother(mary, sue).
mother(mary, bill).
mother(sue, nancy).
mother(sue, jeff).
mother(jane, ron).

father(john, sue).
father(john, bill).
father(bob, nancy).
father(bob, jeff).
father(bill, ron).

sibling(bob,bill).
sibling(sue,bill).
sibling(nancy,jeff).
sibling(nancy,ron).
sibling(jell,ron).

还有一件事,我如何优化兄弟的规则,使X不是自己的兄弟.

如果您尝试复制图表,看起来您的一些公理是错误的或缺失的.

失踪:

female(jane).

father(john, bob).

错误:

father(john, sue).

这可能会导致兄弟规则发生冲突.但是我对prolog有什么了解