I get on quite well with my sister, although we have little in common. There's no animosity, but equally little conversation. I've tried throughout my life to instigate things like going on holiday together, but it has never happened, even once.
She lives about 600 miles away, very close to my parents. I will be staying with my parents on my birthday (she knows the dates of my visit) and I have just heard that she's not free.
AIBU to think that if your sibling has travelled the length of the country it would be nice to be available on their birthday? It's not for over a month, so not as if it was a last-minute thing. She doesn't ever seem to make herself available when I visit and often has things booked up.
I'm not going to make a fuss, but I'm a bit disappointed.