parent(ram,rahim).
parent(gita,rahim).
parent(shyam,raj).
parent(anita,raj).
parent(anita,smita).
parent(ravi,smita).
parent(sita,gita).
parent(sita,anita).
parent(smita,sudha).
parent(ravi,sudha).
male(ram).
male(rahim).
male(shyam).
male(ravi).
male(raj).
female(gita).
female(anita).
female(smita).
female(sita).
female(sudha).
father(X,Y):- parent(X,Y),male(X).
mother(X,Y):- parent(X,Y),female(X).
sibling(X,Y):- father(Z,X),father(Z,Y),mother(W,X),mother(W,Y),X\=Y.
stepsibling(X,Y):- father(Z,X),father(Z,Y),X\=Y.
stepsibling(X,Y):- mother(Z,X),mother(Z,Y),X\=Y.
brother(X,Y):- sibling(X,Y),male(X).
sister(X,Y):- sibling(X,Y),female(X).
stepbrother(X,Y):- stepsibling(X,Y),male(X).
stepsister(X,Y):- stepsibling(X,Y),female(X).
ancestor(X,Y):- parent(X,Y).
ancestor(X,Y):- parent(Z,Y),ancestor(X,Z).