So since before birth, MIL has paid for all of her immediate family to go on holiday where they rent a (very) big house for a week by the sea side.
BIL and family fly in from the US for it, and it's when dc see their cousins the most. We do all enjoy it but it can be boring. Even though the house is very big (for 18 people), DD 21 and her cousin (14) have to share a room.
MIL puts lots of pressure to make sure we all go. She constantly makes passive aggressive comments like "Oh won't it be lovely that we're ALL there together"... "Saul it'll be so nice that you will be there"
Now my DC are graduated from university or the one is at university. My graduated DS booked a week off work for it. My DD at university wants to apply for a summer job that falls over the dates of the week of the family holiday. Would I be unreasonable to suggest that she applies for the job and if she got it, then to go? Or is MIL unreasonable to expect her there?