i need to help fix my broken family

my family is so messed up and i don’t know how to deal with it anymore. my dad is a narcissistic, emotionally abusive, alcoholic. and my mom is so mentally drained after living with him for 22 years. she finally got up the nerve to leave him and i thought things would get better but they have only gotten worse. my mom is very sick from living with my dad and so mentally broken that i’m really worried about her. on top of that my sister was raped last week and now she feels so many emotions that i have no idea how to help her with. i feel like i’m taking care of everyone and i’m trying to be there for my mom and sister and dad all at the same time. my sister has reached her breaking point and last night she got in a drunk driving accident. i’m so concerned about her and tomorrow when we go see my dad he is going to scream at her. i don’t even know how to keep every thing under control. i feel like i can’t do anything anymore i’m only 14.