is this bad?

Hi everyone,

I want opinions. My boyfriend has kids which is totally okay and I totally accept that. His baby mama has the kids. Kids can’t stay with us because we don’t really have the space. His baby mama always seem to have problems wherever she goes to live. He once had to have her moved into his moms house because a guy she was with threatened to kick her and the kids out. Long story short she moved back with this guy 9 months ago. Same thing just happened again he threatened to kick her out again now she’s moved in with my boyfriends dad? is this weird? opinions please. I have accepted this because I don’t think I have a reason not to. Shes 21 and seems like she’s going to be needing help the rest of her life lol. I’ve been with my boyfriend 2 years and it seems as if everything she gets into he has his family bail her out if situations....He won’t let her have a boyfriend etc its like he tells her no boyfriend or make her drop her relationships...