Mother marrying a man who committed zina with her daughter

Q: I have done something terrible. I slept with my mother's husbend before they got married. I have not told her and they have been married for 4 years now. But I am full of regret and full of guilt. I am also married now Alhamdulillah and don't know what to do. I can't sleep or focus on anything. 

A: Your mother's marriage is not valid.

And Allah Ta'ala (الله تعالى) knows best.

Answered by:

Mufti Ebrahim Salejee (Isipingo Beach)