parent(nariman,zal).
parent(zal,sam).
parent(sam,rostam).
parent(sam,ghazanfar).
parent(sam,petros).
parent(rodabeh,rostam).
parent(tahmineh,sohrab).
parent(rostam,sohrab).
parent(sodabeh,siyavash).
parent(gordafarid,rodabeh).
parent(gordafarid,sodabeh).
parent(afrasiyab,tahmineh).
parent(giv,rodabeh).
parent(giv,sodabeh).
parent(giv,mehrzad).
parent(shahrzad,mehrzad).
male(nariman).
male(zal).
male(sam).
male(rostam).
male(ghazanfar).
male(petros).
male(sohrab).
male(siyavash).
male(afrasiyab).
male(giv).
female(rodabeh).
female(tahmineh).
female(sodabeh).
female(gordafarid).
female(mehrzad).
female(shahrzad).

grand(X,Y) :-  parent(X,Z),
	       parent(Z,Y).
grand(X):-     parent(X,Z),
	       parent(Z,Y).
grand(X,Z,Y):- parent(X,Z),
	       parent(Z,Y).

grandmother(X,Y) :- grand(X,Y),
	            female(X).
grandfather(X,Y) :- grand(X,Y),
		    male(X).
grandfather(X,Y) :- parent(X,Z),
	            parent(Z,Y),
		    male(X).

grandparent(X,Y) :- grand(X,Z),
	            parent(Z,Y).
grandparent(X,Y) :- parent(X,Z1),
	            parent(Z1,Z2),
	            parent(Z2,Y).

spouse(bizhan,manizheh).
spouse(X,Y) :- parent(X,Z),
	       parent(Y,Z),
	       X\=Y.

father(X,Y):- parent(X,Y),
	      male(X).
mother(X,Y):- parent(X,Y),
	      female(X).

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

sisterbrother(X,Y):- parent(Z,X),
	             parent(Z,Y),
	             female(X),
	             male(Y),
		     X\=Y.
brothersister(X,Y):- parent(Z,X),
	             parent(Z,Y),
	             male(X),
	             female(Y),
		     X\=Y.

sister(X,Y):- parent(Z,X),
	      parent(Z,Y),
	      female(X),
	      female(Y),
	      X\=Y.
sister(X):- parent(Z,X),
	    parent(Z,Y),
	    female(X),
	    X\=Y.
sister_tani(X,Y):- parent(Z1,X),
	           parent(Z1,Y),
		   parent(Z2,X),
		   parent(Z2,Y),
	           Z1\=Z2,
		   female(X),
		   female(Y),
		   X\=Y.
sister_natani(X,Y):- parent(Z1,X),
	             parent(Z2,Y),
	             parent(Z,X),
		     parent(Z,Y),
		     Z1\=Z2,
		     Z1\=Z,
		     Z2\=Z,
		     female(X),
		     female(Y),
		     X\=Y.

aunt_m(X,Y):-  sister(X,Z),        %khale
	       mother(Z,Y).
aunt_f(X,Y):-  sisterbrother(X,Z), %ameh
	       father(Z,Y).
uncle_m(X,Y):- brothersister(X,Z), %dayee
               mother(Z,Y).
uncle_f(X,Y):- brother(X,Z),	   %amoo
               father(Z,Y).