My FI & his X-WFE (mother of his children in our wedding)have a cordial relationship, yes I'm fine by her too. However, the 3 of us are in no way "friends" or "close" for that matter; we are mutually respectable and we are able to talk as adults. She has her life, we have ours.
Imagine our surprise when she asked if she'd be invited to OUR wedding. Surely, we thought, she must be kidding. But standing there she begin telling us how great we are together and that even though we had a rocky start we have grown past that and she's glad we have come to a place where we can "work together". We do work together, because we HAVE to, for the kids. that in no way takes us to the point where we share special events outside of the kids b-day parties.
So, my FI says no. I say hell no. how do we (by we I mean him) tell her that just because we have a cordial relationship for the kids doesn't make her a part of our private life? She seems to think there is no seperation between the two.