% these are the family facts 
female(pam).
female(liz).
female(ann).
female(pat).
male(tom).
male(bob).
male(jim).
parent(pam,bob).   % pam is parent of bob (etc.)
parent(tom,bob).
parent(tom,liz).
parent(bob,ann).
parent(bob,pat).
parent(pat,jim).
