MIL is one of three sisters. Sister 1 is having a birthday party next month. They live a few hours away from the rest of the family so will include a couple of nights stay.
Sister 1 invited her own children and grandchildren and also her two sisters and their husbands. Sister 2 has taken it upon herself to invite her own children and grandchildren which is causing problems with the logistics so some changes have to be made.
DH is an only child, we are the only family members who are now not going.
MIL has made it very clear that her sister 2 should not invited the rest of her family and is really angry at her. She’s not even mentioned the fact that we are left out or that she would have liked us to be there.
AIBU to feel a little upset that no thought is being given to the fact that we are being left out?
Just adding that it’s not unusual for us to be left out. Sometimes family members visit the ILs (it’s a convenient place to stay) and they never think to include us even by inviting us over for coffee.