Answer:
(Fatwa: 1237/1162=D/1429)
If you did not perform your hajj in spite of it being obligatory upon you, then it is makrooh-e-tahreemi for you perform hajj on behalf of grandfather. You should first perform your own hajj otherwise send for hajj badal a person who has already performed his obligatory hajj.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
