|talmud=Yevamoth 49a-b, 69a, 78b, 87b, Kiddushin 67b and 73a|rambam=Laws of Forbidden Relations 15|sa=Even HaEzer 4}} In Halakha (Jewish religious law) a Mamzer 's a person born of certain forbidden relationships between two Jews. That's, one who's born from a married woman as a product of adultery or someone born as a product of incest between certain close relatives. A mamzer's considered a son or brother for the purpose of inheritance and levirate marriage A Kohen can become defiled for a clo… (More on Mamzer)