Allah has not put for any man two hearts inside his body. Neither has He made your wives whom you declare to be like your mothers' backs, your real mothers. [AzZihar is the saying of a husband to his wife, "You are to me like the back of my mother" i.e. You are unlawful for me to approach.], nor has He made your adopted sons your real sons. That is but your saying with your mouths. But Allah says the truth, and He guides to the (Right) Way.

Call them (adopted sons) by (the names of) their fathers, that is more just with Allah. But if you know not their father's (names, call them) your brothers in faith and Mawalikum (your freed slaves). And there is no sin on you if you make a mistake therein, except in regard to what your hearts deliberately intend. And Allah is Ever OftForgiving, Most Merciful.