How do I tell my mom to grow up?

My mom has never ever been stable and has never been a good role model for my sisters and me (4 girls total). Growing up we saw lots of men move in and out of our homes (I didn't even realize how bad that was and the amoung of danger she put us in until recently)and many times these men became violent and physical with her. I will say she's done a lot to make sure we have a roof over our heads and that we eat and have nice clothes but that's the job of a mother. Let's talk about the men she dates: mostly drug dealers or unemployed men without jobs and cars. To me that isn't a man... Her current boyfriend falls into this same category like the rest. He has lots of kids is on child support and doesn't have a job, almost refuses to get one. He uses my my mom's suv to drive around the hood and sell drugs or whatever so no car. They argue all the time and like every 2 weeks they make this huge ass deal, pack all of his things and pretend like he's moving back to his mother's. They stay gone for a few hours then he's right back in our home hauling his expensive clothes and shoes and his low work ethic through our front door. My mother is a registered nurse and she's in school for something else so she isn't like as bad as him. It's hard for her to find jobs because of her record but she's worked at plenty homes, she can't keep a job and she's collecting unemployment. I know she wants better but I feel like she's not working hard enough? Like why bring Me and my sisters into their arguments saying "oh he won't do this and won't do this so he can't live here anymore he's only bringing me and my kids down" but she takes him back every. single. time. I just want her to boss up you know? He's really no good and he really is holding her back. Today they argued because my mom wants to move to Dallas and he wants us to move to a city called Poly a Fort Worth ghetto and that's just not going to work for my family I know. I just don't know how to go about this situation like I'm really tired of the both of them. I want to stay respecftul but I'm really losing it.

Ps. don't take offense about my "hood" comments. There is nothing wrong with living there but my mom has worked hard to keep us away from areas like that and it would be a really big change and we don't need it.