Q: Is your رضاعي nieces رضاعي daughter haraam for you?
E.g. Muhammad and Fatimah are raza’ee brother and sister. Fatimas daugher Zainab, feed Ayesha. Are Ayesha and Muhammad haraam for each other or are they mahrams?
A: Yes, she will be haraam.
And Allah Ta’ala (الله تعالى) knows best.
Mufti Ebrahim Salejee (Isipingo Beach)