Fortunately my brother is not in to stuff like that.
It's really tough, and one of those things that you have to deal with as an emigrant that is not in the playbook.
Do you have more brothers? If you do can they be of assistance somehow? Does your brother look up to you, see you as a role model? Does he have good friends?
It's tough. My dad was an all-out alcoholic, he drank more than anybody that I've ever seen, before or after, and on top of that he was violent when drunk. It gave me a fantastic warning about what kind of an effect alcohol can have on people and as a result I never drank a drop.
So I really feel for you, but if it turns out that you can't make a difference don't be too hard on yourself.
good luck!