Is there room left in the boat? Good, cuz I'm climbin' in.

I know exactly what you're talking about, been-there-done-that-got-the-t-shirt with my family's picture on it. I have no one left but my two kids and any friends I can make along the way.
You have every right to feel slighted by the whole thing. I agree with Leed that you should try telling your family how you feel. See what they say AND what they do after that. But if they can't change, then like what madisgram said, you may need to maintain a healthy distance from now on.
From my own personal experience - My life has been much happier since I installed the "healthy distance" with my family. The biggest motivation in that for me was my kids - I don't want them to have the same mental abuse I went through with my mom and I don't want them exposed to the alcoholism either.
Best wishes to you! Come to PC for online friends anytime.