I agree with Scott also. I would suggest that you and your dad hit up some ala-non meetings. I am an alcoholic and when given ultimatums they turned into great reasons to drink. I wanted to not disappoint, ruin relationships, get into trouble, choose booze over family, but addiction won out until I was ready. As someone that doesn't have alcoholism, you won't understand but doesn't mean you can't learn and empathize. Also, maybe encourage your mom into some sort of treatment program or AA. Good luck