Family drama

I don't really know what to do in this situation. I might be posting this just to vent, or maybe to hear some advice from those who have had a similar situation.

I am the baby of 3 girls. I recently quit talking to the middle sister we will just call her M. She's a very toxic person. She manipulates people to believe she's nothing but a victim in everything. This has caused her to ALWAYS get free stuff because of it. I mean she literally got a free car because she made up some big sob story. She's very poor because of her own actions. She's not a good mother at all. I've unfortunately called CPS so many times and she weasels her way out of it somehow. Her ex husband recently lost custody of her kids because he didn't show up to the court hearing so of course it was handed to her. Now she blasts all over how she WON full custody. When it was really just givin to her because the dad isn't honestly any better. Well she is now engaged to another man who is just as bad as her ex husband. So I want nothing to do with her at all.

My oldest sister doesn't want anything to do with her because we are just so tired of her drama. Since being with this new guy M has ran to me or our oldest sister saying how she wants to leave him blah blah then the next day they're just so inlove. So we're tired of her crying wolf especially if she hasn't learned from her ex husband. M has also posted statuses about me on Facebook saying how I'm so hateful. So my oldest sister is not ok with that at all.

Well this morning my mom started going off on me about it. And hung up on me while I was talking. And now it just makes me even more angry. My mom is honestly just as toxic. She was literally telling me seconds before how she wished her husband would have nothing to do with his sister's because they hate my mom. Yet I'm the bad guy because I want nothing to do with mine? Lol. On top of that my mom made it all about money. Which is typical since my mom is a gold digger. None of this even has anything to do with money though. It's just the fact that my sister is so manipulative and always the victim. It's about the fact that she puts every guy before her kids. A couple months ago she was doing meth and left her kids out in the living room with absolutely NOTHING to eat. They only food they had ate was gas station food. So I had to instacart them grocerys. It's the fact that she's a full blown alcoholic, she even tried to hide several shooters in my oldest sisters bathroom trash while claiming she was sober. She even ended up in the hospital with a pancreas that was about to blow a year ago from drinking. But she doesn't care, she's choosing death before her kids at this point. I just don't understand how I'm the bad person for wanting that negative out of my life.