((((( Jenn )))))
Family relationships are crazy and stressful enough on their own...throw alcoholism into the ring and BAM!
Up suddenly means down and out means in.
The way they treat you might have nothing to do with you at all, but more about them and their frustrations in their own lives. Your sister plays into their twisted needs...you don't. Of course she is perceived as the (enabling) princess.
Take frustration, anger and fear and throw alcohol on it.
Everyone in the path gets burnt. Whether you did/do anything wrong.
The best you can do is try and get out of the way and save yourself.
Petunia