بسم الله الرحمن الرحيم
(Fatwa: 864/685/B=1434)
When your friend or his parents do not have the capacity to go for hajj then hajj is not fardh on them. There is no need to take loan on interest. Your friend should send his parents on hajj when he has enough money.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
