Boyfriends parents

So I’m 6 and a half months pregnant and I’ve been with my boyfriend for 6 years but I don’t like his parents. His mom is in an abusive relationship and won’t leave and her partner won’t let her even do anything. And his dad is just kinda weird and his stepmom used to be really mean to him. And they all smoke cigarettes even with me being around. I’m not comfortable around them and I don’t really like them. I don’t want my child to be around people who smoke cigarettes either. And when ever they invite us over I try to stay home but my boyfriend gets mad at me. Also my boyfriend is quitting smoking himself but every time we’re with his parents they give him cigarettes and it drives me nuts! And their house is really dirty and I know in the future I would not be comfortable bringing my child to their houses. What should I do about this?