Mother with mental health problems.

Anyone has a parent with Bipolar/Manic Depression with Schizophrenia? How do you deal with it? I'm about 5 seconds away from blocking my mother out of my life completely. She has ruined not only my life but my siblings life as well. All of her abuse (physically, mentally, emotionally) has driven us apart. My mother used to beat me as a child and put me out at 12. My brother has literally been to therapy since 18 because of the mental abuse she did to him. My sister is almost 20 and basically left my mom because she was tired of the way she was being treated by my mother. When she gets into these modes she lashes out on everyone for not doing what she wants even if she doesn't explain what she wants. My mom blames my dad for everything and constantly calls him a deadbeat even tho he has been in our life the entire time. She used the child support for my sister to buy cigarettes, liquor and buying stuff for her friends. My sister doesn't have Identification, her birth certificate, social security card and my mother refuses to give it to her. Everything that we say and do is wrong and she knows it all. She has on numerous occasions blacked out from spraying bleach around the house and pouring wood stain on the floor. If I try to explain to her how to do certain things she calls me stupid and says I'm disrespecting her. I just don't know how to help her anymore I have my own kids, a husband and now I have to help my sister too.

Edit*** She refuses to see any doctor because with all her ranting they will put her back in the psych ward. In her eyes it's nothing wrong with her. Once she told me no doctor in the state will see her because she thinks she is banned. I told her this is illegal and she got mad and called me a liar and idk what I'm talking about.