My parents marriage is falling apart. What to do?

[Quizzical]

Unfortunately, there isn't much you can do in this situation, when one is drunk there can be a ton of things going wrong in your dads head. He probably isn't thinking straight, if you dad is abusive and always angry even when sober, then I would suggest getting your mom to get a counselor to sort out this issue with your father. It really does suck having to read this and think of what you go through everyday, all the best.