Forbidden to you are your mothers and your daughters and your sisters and your paternal aunts and your maternal aunts and brothers ' daughters and sisters ' daughters and your mothers that have suckled you and your foster-sisters and mothers of your wives and your step-daughters who are in your guardianship , ( born ) of your wives to whom you have gone in , but if you have not gone in to them , there is no blame on you ( in marrying them ) , and the wives of your sons who are of your own loins and that you should have two sisters together , except what has already passed ; surely Allah is Forgiving , Merciful .