My parents got a divorce when i was 5, which is probably a good thing!The s.w.a.t. team was called to the house because my drunk dad had a gun to my mom's head and i remember a sheriff rescuing me and my sister from the bedroom window.We moved in with my grandmother.(mom's mom) til she started dating my now step-father.My mom went from a "christian",mother to a neglagent meth-head parent.My oldest brother ended up in foster homes and my sister and i had to stay with friends after my mom went to jail for writing hot checks.when i was 16 i had 1,500 saved up for a car, but used it to get an apartment with my mom away from my abusive step dad because my mom's reason for not leaving him was because she had no money.3 months later, she moves him in with us.She used to give me meth everyday from ages 15-18.Now that she's clean she just expects me to forgive her and to "quit bringing up the past" i want to have a normal relationship with her, but i fucking hate her and i just can't get over all the shit she's put me through!!i don't know what to do..i'm 25 and she's still with my step-dad!!!she still chooses him over us!!!

In a similar mom-hating situation, I just cut off all contact with her. She will still not admit to being insane or abusing me... but after time, I can still kind of talk to her and have a somewhat friendly relationship (though I still call her by her first name).
You should try to be thankful that you made it through and try to keep moving on with your life.
You can do it.
Her step dads an abusive fuck and her ex meth mum chooses him over her daughter that seems to have made sacrifyses for her!
Kids come first and always do come first. Anyone that thinks other wise dose NOT deserve to have kids!
OP, you've lived a very neglectful childhood filled with iresponibility and violence. The best thing I could sugest Is to stick close to your siblings. You all went through it and understand fully how you each feel. Comfort each other if you feel it nessecery. You're old enough to escape from it all now, but if you have other siblings under your mums or stepdads care. You should get them out of there for their own protection.
It would be understandable to not want to see your mum at all. It seems you have unconditional love towards her though. Life would be alot easyer without this, but it's not easly discarded. Do you see a therapist or counsler? They may be helpful when comeing to tough desitions you are faceing. The choice your mother has made though, is her own. You may not be able to change it. Can you honestly say that you diddnt expect it? If you dont already, keep close to your siblings and seek a counsler. You're bound to have a few confusions in your situation, it's normal. Good luck.
BTW Since your brother was isolated from you, your sister and parents. Im sure he feels like a stranger, unwanted, lonely... make sure he's ok, please. If you havent already.
Not normal and far from it. No one should have a child hood experiance like that.
Good luck