What you have went through is horiffic, and is absolutely no fault of your own.

I apologize for being so blunt, but I say "to hell with your family". They have ALL done you a disservice. They weren't there for you in your darkest time of need. If you can move away and lose contact, I would. Finding a good therapist that works for you would be great, too.

A house is just a house. What makes it "home" is when people you love are care for reside there. The same thing goes for a family. Blood relation is just blood relation.
At the end of the day, it doesn't mean anything. It's a group of people that love you and care for you and are there for you that make it a "family". I have never been close to my family, but the friends I have made along the way have become my family. They are there for me way more than my family ever has been. I would suggest you look for the same sort of support network. It literally pissed me off reading this thread and how disgusting it is that your parents didn't do anything about it.

Don't worry about the dreams. Again, that isn't your fault. Our brains are very complex, sometimes to the point of being unexplainable. Trauma does strange things to our mind. Talking to a therapist about it will help, but sadly we can't control what we dream. Just know that none of this is your fault, and I am so sorry you went through it. I hope with more time, you'll continue to be able to cope more and live a normal life.