A little background: my partner has a DF is decades remarried. There is my DH and also another adult step sibling. His DF and DSM book several holidays a year with his step sibling and we are sometimes invited but usually not. They have recently messaged to tell us they are all booked up to go away for a week in the summer and would we also like to go.
We generally get on well with my partners DF and DSM, although see much less of them than they do the step sibling and partner and DGC. They offer to take our child once a week and the other DGC 2-3 days a week.
AIBU for us to say something about the after thought invite to the holiday? We generally just decline as don’t have the money relatively last minute (last minute in the sense it’s thousands and only maybe half a year away etc) plus if I’m honest we feel awkward to join last minute as it’s clear we weren’t considered at the time of booking or involved in any conversations whatsoever about where we could all go etc. We have always just accepted the dynamic and not said much as we wouldn’t want an argument. We also always thought it’s because there was grandchildren on the other side and assumed we might be included more now our child is here, but clearly this hasn’t been the case.
Does anyone have any advice on how to diplomatically decline but make the point about it clearly being an after thought to invite us? As our child gets older if it keeps happening and they realise, I would cut ties as I’m not having them feel the way my partner often does.