I can empathise with you, I have a,daughter with 3 children. The oldest 2 have the same father and the youngest a different father . None of the fathers or other grandparents are on the scene. My husband ( her stepdad ) and I have done so much over the last 13 years, since the first one was born. However since I started suffering with Arthritis a few years ago , we have done less. My daughter can get quite irritated with me if I can't do something she wants me to do. We've fallen out before and I've also tried talking to her . Nothing really changed until last year , I just stopped being at her beck and call. My husband took early retirement and we've holidayed more, she still has a little dig at times , but now I don't respond. If you're not organising the family gathering, then it's not really your fault if the younger children aren't invited,