Still her daughter in law

So.. my bf and I moved pretty fast in our relationship . We connected on day one its like we were made for eachother. Our relationship is great I couldn't ask for a better man , hes everything ive ever wanted. 7 months into the relationship and I find out im pregnant which was crazy being that a year ago I left my fiance and he and I had tried for years with no luck (wasnt meant to be). Im now 6 months pregnant .Ive met his family and theyre amazing people but his mother still calls my bfs ex, her daughter in law. The ex will comment on my bfs pics on Facebook, he will ignore them but his mom and sister will interact with her. It bothers me ALOT and it shouldn't being that no matter what she does my man won't entertain her but.. his family still does and it makes me feel like they'd rather him be with her. I even feel immature bringing it up to my bf as he has zero control of his mom or his sister. Would asking him to block or unfriend her be too much?