I am a Muslim brother of 25. Am I mahram or non-mahram to my foster son’s wife? (Child that was breastfed by my wife while under the age of two). Am I mahram or non-mahram to my foster son’s children?
بسم الله الرحمن الرحيم
(Fatwa: 1161/1233/L=11/1437)
As the wife of real son is mahram, in the same way the wife of foster son is also a mahram. It is not necessary to observe purdah from her. Its detail is available in the footnote of Sharh Wiqaya.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband