The Ruling on Marrying the Daughter of the Sister's Husband
Question :
Is it permissible for me to marry a young woman whose father is my sister's husband, but she is not my sister's daughter, but the daughter of my sister's husband, bearing in mind that she says to me: "You are my uncle," and her age is eighteen years. and I fear to say to her. "I am not your uncle." So is it permissible for me to be frank with her regarding this and to marry her? Advise me and may Allah benefit you.
Answer:
Yes, it is permissible for you to marry this girl, since she is not of your kin and her father is unrelated, even though he is the husband of your sister, and her mother is unrelated, even though she is your sister's co-spouse. So you are not the uncle of this girl, therefore it is permissible for you to marry her. And it is Allah Who grants success.
Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 5 Pages 229-230
Share on WhatsApp