[Sundae]

My sister has a very set schedule when they go away.
Mum & Dad go along with it, so I'd always be doing what other people wanted. She also doesn't put any store in my opinion, very rarely addresses me directly and doesn't consider me to be family in the same way she does Mum & Dad. For example she's often invited them over since I've been living here, excluding me. Mum asked if I was invited the first couple of times, but stopped asking when the answer was No.

It's just easier not to go. Especially as Mum would feel caught in the middle. This way they all enjoy it.

I still get to go out for the family meal, and my bro & SIL will be there, so there's not any awkwardness.