Hi Alex-
Welcome to SR.
I grew up with an A father too. IT TOTALLY SUCKED!!! Your post reminded me of the rage I often used to feel. Rage, fear, shame and helplessness were pretty much bread and butter emotions for me. It took me a lot of AlAnon and therapy to heal myself.
Can you try AlAnon or AlaTeen? I felt such a huge relief when I went to my first AlAnon meeting. I was scared, and it seemed weird at first, but I sure recognized what all those people were talking about. It's free and helps the family & friends of alcoholics get their own sanity and life back. i learned some excellent coping tools there.
How old are your sisters? Maybe you can all seek help together.
Stick around - and check out the "CLassic Reading" in the stickies at the top page of the forum.
Peace-
B