23 yr old raising a 16 yr old?

I've never been to an AA meeting. Though my mom has been to a few. Yes she is an alocholic.. ever since I was younger I felt I've been rescuing my mom. Shed date abusive men, I've been around more than enough to witness that. Called the cops plenty of times. My mom didn't raise me. I left when I was 8. My sisters biological dad threatened it kill my mom and sister in front of me if I didn't leave. It was a blessing in disguise. My dad did a great job raising me. My mom hasn't really done that well with my sister, never setting boundries, letting her get away with anything and the list goes on. Its really hard for me to step in and try to switch it up so late in the game. If I say no, my sister calls her mom to see if she'll say yes because that's what she woulda done before. Its crap. My mom is always so willing to run away from her problems. Its so much easier for her to leave my sister with me and go lay around all day. I know she's capable of more, she's a strong person. I love her to death I'm just really dissapointed in her lack of motivation. Ya know? I feel that I carry all this weight of her on my shoulders. Like I still need to support her and hold her hand so she doesn't get off track. Its exhausting. As for my sister, she's almost just like my mom and it scares me. Id love to help my sister and hold her hand, but I think id be tearing myself down trying to fight with the both of them. Before I let my mom move in I debated with myself to either help her to the best of my ability or stop dealing with her at all. Constantly calling me drunk. She got drunk at my house and embarresed me/herself in front of my husbands coworkers. My dad always taught me to rely on no one, be strong and take responsibility for my actions. So it frusterates me so much that she can't do that and her 23 yr old daughter can. I want her to live her own life without my help. Id be so proud of her to finally stand on her own, make her own decisions, be sober....ect. not sure if that will ever happen. Reciently I found 4 packs on smokes and a condom in my sisters room. She's already had one MIP.. if she gets caught now its mine and my husbands butts on the line. If she gets pregnant, will we be expected to take care of and provide? Or would my mom?
Not to mentions my families hate for my husband. Mostly because he wrote up a contract for my mom to help her keep on track. I wrote it too. Now my whole family (moms side) won't talk to us. My mom says bad things about him to me. She doesn't respect him, neither does my sister. He does a lot for this family and gets nothing, not even respect in return? They all try to tell me I'm better off without him. Why? So I can sit around all day with my mom, aunt and gma and talk about everyone else because my life sucks. I'm not about to throw away the best thing in my life, for my mom. I made my own family, and we'll be strong respectful and responsible people. Yes I feel bad still about asking my sister to leave but I can't do this anymore. Some days I wanna break everythin I see because I'm so angry.... I want my mom to step up and be the mom she knows how to be, just to lazy to care right now.

Anyhow, thanks for listening.