بسم الله الرحمن الرحيم
(Fatwa: 1089/1089/M=9/1434)
Your father may offer witr salah behind the imams of Haramain with jama’ah. However, when the Imam stands after turning salam on two rakah he should stand without turning salam, and continue to the third rakah and thus complete his salah.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
