(2) Does this ruling apply only to the husband or can a woman pray behind other man also who are not an imam of any masjid like father-in-law, brother, colleagues, friends.
بسم الله الرحمن الرحيم
(Fatwa: 1040/1040/M=1434)
If the wife offers salah behind her husband she would stand behind him and she shall read all things that a male muqtadi recites behind imam i.e. sana, tasbih of ruku and sajdah, attahiyat, durood and dua and she will not recite surah fatiha or any other surah at all, rather she shall keep quit at the time of qirah. In case she offers salah behind other person instead of her husband then too the ruling shall be same. However, if the imam is non-mahram then it is necessary have purdah. However it is better for women to offer salah at home alone.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband