I have an older sister and she’s married with children.
I’m pathetic, single and childless.
Each year my sister and her family go away to a seaside town. My parents also book to go to the same location at the same time.
Because they don’t physically stay in the same holiday rental they claim that it’s not a family holiday and just a coincidence 
- basically their loophole to not invite me.
AIBU to be so hurt by this?