Can a person marry his wife's sister's daughter? If he does, is the nikah valid?

In the Name of Allāh, the Most Gracious, the Most Merciful.

As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.

1.) No, you cannot marry your wife's sister's daughter until you are divorced from your wife and she finishes her iddah or she passes away. [i]

2.) If you do marry your wife's sister's daughter while you are married to your wife, then that 2nd nikāh will not be valid and any relations with your wife's sister's daughter would be zinā (adultery).

Your nikāh to your wife will not be affected and will remain intact.

And Allāh knows best.

Ml. Sohail Bengali

Chicago, IL (USA)

Concurred by:

Muftī Abrar Mirza

Chicago, IL (USA)

Under the Supervision of Muftī Ebrahim Desai (South Africa)