Is it permissible for a father-in-law to marry his daughter-in-law’s sister? 

Q. Muhtaram Mufti Saheb. Will it be permissible for a person to marry his daughter in law’s sister JazaakAllah 

A. It is permissible for a man/father to marry his son’s sister-in-law/daughter-in-law’s sister. (Shaami 3/31) There is no prohibition in this regard.

Allah Ta’ala Knows Best

Mufti Ismaeel Bassa

themufti.com