My father was also an alcoholic and at age 53 he shot himself to death. I felt guilt for all the same reasons you feel right now. The difference was I had already made peace with him and his disease before this happened. I told him I loved him, and I forgave him...but his disease was just that...HIS. When he was sober he was allowed to call me, and when he was not I told him I had to go. It was hard at first but once he figured out that I was not going to let HIS disease affect my life he started calling when he was sober (or not as drunk) and things were a bit smoother. He still let HIS disease kill him, but that was HIS choice. You are not responsible for the effects HIS disease has had on himself. If your little brother needs you then step in by all means and take him home with you or get him other help. Otherwise you have a choice to not let HIS disease kill YOU.