Bit of backstory before I explain - my DH has a DC from a prev relationship, DC is a (fairly young) adult now and has their own child who is a few months old. Things didn't end well with the ex, there was a lot of animosity and when she got wind of him being in a new relationship (no overlap btw, it was about 8/9 months after they split that we got together) she prevented him and his family having contact with his DC for a long time until he got solicitors involved. There were still issues over the year with the ex over money, contact, general slagging off of his family etc. but things eventually settled down to a point, though DH and ex don't have contact if he can help it.
We've been together for over 15 years now with 2 shared DC, his DC is grown up and has recently had their first child. DC doesn't drive - this is relevant. We all get on pretty well, no issues!
We had a family 'do' recently and PIL were there. I noticed MIL had her nails done and commented they looked nice, she then proceeded to say that DH's ex had brought his DC and DGC over and done them for her. So basically, he ex-DIL (ish, they weren't married but whatever) had come over, been in their house for a few hours and done her nails for her (it's her job, she's a nail tech).
I feel hurt by this but I cant quite articulate why. I know they want to see their DGC and their new baby, but why on earth did the ex have to come over and furthermore, why is she doing her nails? There are plenty of places to get nails done. I think I could have dealt with it better if the ex had simply dropped her off and popped in for a cuppa (though it would be weird!) but its the nails part that feels really off.
I have tried to explain it away in my head that well, DC doesn't drive (in laws live about 45mins drive from DC) and their partner who does wasn't around, so that's how DSC could get to the PILs but actually, myself or DH could have taken them if they or DC had asked us? They've had no relationship with ex in the past 15 years, why now?
It feels disloyal. They didn't tell us until I mentioned the nails, so not sure they would have. I spoke to DH and he feels the same, but also said he doesn't want to make a fuss or cause a big argument as his DPs have both had their own health issues lately and he doesn't want to rock the boat. But part of me wants to ask what on earth they were thinking? Where is the loyalty - not just to me, but to their son?
It would be different if they have split amicably and maintained a relationship through the years - but they didn't and they haven't. Am I wrong to feel this way? And would you approach it with them?