Want to run this by the collective before I dig my heels in completely. Will try to include everything so as not to drip-feed.
FIL (with whom I have a strained relationship) wants to have a 60th dinner / party. It will be at a particular hotel, his friends / acquaintances will have to stay at the hotel while our family stay at their house and he will find "someone from the hotel or the village" to babysit. Depending on the timing this may involve putting dcs (5 & 4) to bed. We will never have met this person before - there may be a chance to meet them for about 10 minutes during the afternoon or something. It will be an acquantance of ILs, not someone from an agency or anything.
Given that this event will involve the dcs having to make a 3 hour car journey there on a Saturday and then again to go home the next day, they're only going to se their gps for a couple of hours each day, and they'll be busy with their grown up friends.
I'd rather organise a sleepover for the dcs with friends, or get their auntie / my parents to come and look after them. This may well cause offence - AIBU??