Im going through the same thing.My husbands brother is a single dad with 1 kid and lives in his parents basement.he doesnt have to live there,he makes enough money.Anyway,his DD can do no wrong.if my kids do anything they get looked at like there really bad kids,my niece can do the same thing or something worse and they laugh thinking its cute.
My in laws have an RV and they own a little lot at an Rv park.they mostly bought the lot because it will be fun for the kids to go there in the summer so they can swim and stuff.We stopped going to the rv park because everything was always about my niece.My kids loved to bike ride there because theres no cars, and only my DD liked to swim.Anyway,everyone got mad at us because my kids wanted to bike ride that day when my niece wanted to swim.They didnt want my niece to be upset.
Another time my kids had colds. We called and told them ahead of time that our kids wont be swimming.Its an outside pool and it was a very windy day.They got mad at us again.When my niece has a cold they dont let her go outside at all even on a hot day but they want us to make our kids go swimming on a windy day.
Anyway,I understand what your going through.We dont say anything to them,we dont want to fight but we dont see them as much becase of it.
My in laws have an RV and they own a little lot at an Rv park.they mostly bought the lot because it will be fun for the kids to go there in the summer so they can swim and stuff.We stopped going to the rv park because everything was always about my niece.My kids loved to bike ride there because theres no cars, and only my DD liked to swim.Anyway,everyone got mad at us because my kids wanted to bike ride that day when my niece wanted to swim.They didnt want my niece to be upset.

Another time my kids had colds. We called and told them ahead of time that our kids wont be swimming.Its an outside pool and it was a very windy day.They got mad at us again.When my niece has a cold they dont let her go outside at all even on a hot day but they want us to make our kids go swimming on a windy day.

Anyway,I understand what your going through.We dont say anything to them,we dont want to fight but we dont see them as much becase of it.