Ok so pils own a second home which they do holiday rentals. We get to use it for a week once a year and just pay expenses (electric/cleaner etc). as does sil and her family. We have to use it in school hols as I work in a school. Sil tends to do term time as their ds is only 1. We have generally gone in summer hols as it's been our only hol due to not being able to afford another holiday. We realise this is a busy time but sil tends to use it 5/6 weekends a year on top whereas we only do the one week so we figured it equals out. This year for first time in many years we have book a holiday abroad in summer, we talked about going to seaside house too n decided to see if we could have the house spring half term. Pils have said the can't really let us have it peak time any more due to fact they can rent it. This means we can only go oct or feb half terms which seaside is a bit lacking for kids out of season. But sil n family will continue to use it for a week in june plus numerous weekends. We can't do weekends as dh works plus too far to go one night. Usually due to lack of money this is our only hol. We did enquire how much to cover loss so we could still go but it's more than we can afford to pay. The think is if you add up the losses for all sils uses it's prob not much different to our week it's just more spread out. Aibu to be a bit peeved?