Just wanted a sense check before I tackle this. The subject might be a bit misleading - OW and ExH got married last weekend and they have a 1 year old. He left after I found out about their affair 6 years ago and moved straight in with her so she's been around a while and she has been in my 2 DDs(10 and 12) for about 4 years. They stay with ExH and her every 2nd weekend and 1 day a week. Obviously they are not my 2 favourite people in the world but I like to think I have always remained polite and superficially friendly and we have managed to do family occasions (birthday parties school concerts etc. together). I have always said that as long as she is kind to the children than I'm ok with it. The problem is that it has been brought to my attention by more than a few people that she constantly refers to my 2 DDs as "our girls" or "our daughters" and talks about them to others as if she is their mother and I simply don't exist. She does this in person, on social media (I don't stalk, we have mutual 'friends' who have found this weird), and now in the media (Ex is a z-list celeb). For some reason I find this really upsetting and I want to pull her up on it but I'm not sure I'm being rational about this. After all, the important thing is that she is good with the girls and they are happy. AIBU?