Family holiday

[Fullrecoveryispossible]

Going away with my dp, sister and her dh with their 2 kids, and my brother, his wife and their three kids. We are hiring a big cottage to stay in and they are both wanting to split the cost 3 ways. AIBU in standing my ground that me and dp shouldn’t be paying as much as they are considering it’s just us?

I know a lot of people who do this so they get a cheap holiday and with a family and lots of kids, charge a single person the same.

I think it's fairer to pay for the rooms...