What is the ruling on marrying the wife of one’s wife’s father?

Question : May Allah reward you. The questioner asks: What is the ruling on marrying the wife of one’s wife’s father?

Answer : Yes, that is right. It is as if he wants to marry both the man’s daughter and his wife, the man’s daughter from a woman other than the current wife. Imagine the situation: A man married the daughter of a person named Abdullah. Abdullah had a young wife who was not the mother of his daughter. Then Abdullah either divorced her or died, and the daughter’s husband wanted to marry this woman. Is that permissible or not? Or have you not yet grasped the situation? Yes, you have grasped it well. So, say: This is not allowed. Stand up, or rather, let us return to the example. Yes. Did his wife die, or did he die leaving his wife behind? Good. Or did he divorce her? Good. Listen. Did you understand the example? Is it permissible or not? The answer is: It is permissible. It is permissible for a person to marry both a man’s wife and his daughter from another woman.