Am I being unreasonable?
I have a 4 year old dc and my ILs are doing dinner this year. We told them we can’t do a late dinner as my 4 year old won’t eat after 5 and will just be naughty they said okay and it wouldn’t be that late. Yesterday dinner was at 6pm and today they’re doing again for 6.30/7pm!
So now I’m sat on my own at home with the DC cooking us veggie fingers and chips whilst my DH and other DC are at the in laws with everyone enjoying dinner. 
AIBU to be upset? They’re the only family I really have as well.