I am the youngest of 3 sisters, I was ecstatic when my both of my sisters had children and I spent loads of time and money with my nieces and nephews (age range 30+ to 10) taking them out on my own from the age of 16 to lots of different places, right until I had my own children 20 years later.
Fast forward to now, I have 3 children of my own and my sisters or their children don't make any effort with them whatsoever. My children don't even know which aunt is which because we hardly see each other, even though we live about 25 minutes away from each other. They clearly see each other without me which I don't mind, it's the lack of interest in my children that upsets me.
It hurts so much. I just try to minimise contact because my older child picks up on the different ways their treated now. Aibu to think this is just shitty behaviour? How would you deal with it?