Answer
(Fatwa: 675/628=D/1429)
All or major parts of transactions in banks are interest-based, therefore the profit gained from a bank has the same ruling. That is why taking share of banks is unlawful and haram. The profit earned out of the share is also unlawful and just like interest. You should calmly make your uncle understand about evils and curses of interest saying that it is in Hadith: “A unit of amount from interest, when he knows, is worse 36 times than to commit adultery. The prophet صلي الله عليه وسلم)) has cursed those who take and give interest. (Mishkaat) You should persuade your uncle to withdraw the shares, take back his money and give the extra money received from the deposited amount to the poor and needy without intent of getting reward.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband