Hi Kikki, I'm sorry for the reason you have to post here, but you've come to the right place for support.
Have you heard of the 3 Cs?
-You didn't cause it.
-You can't control it.
-You can't cure it.
So no matter how hard you try, you won't be able to stop your mother's addiction; think of that as a burden you don't have to bear. She is an adult, and only she is responsible for her life.
You're not responsible for looking after her either. I think your father is putting an unfair burden on you by avoiding facing what's going on.
Is there any support around you? Friends of your parents, church, relative, counselling from either yours or your father's workplace? Please don't carry this on your own. You don't have to.
My parents drank heavily when I was a teenager, and I found it devastating. I understand how you feel. Please keep posting and tell us your ideas about how you can find support for yourself.