Foot ball decision Help!?

Hi am just wondering my brother Omar is trying to do football but me and my family don't like the idea cause hes not very strong we gave him other options like Soccer Basketball and Baseball but he said he wants to do Football Omar doesn't even have muscles He is gowning to get hurt and have trauma As a brother i have to keep him safe he said he doesn't want to be a wimp anymore he says he wants to be a man and tough up his Friends encouraged him to do it he gets made fun of cause he told his Freinds his family might say no so they started laughing at him So what do you think i should do about it should we just let him or say no Help!