12yo SIL due to go to camp on Wednesday for a week. Camp is 'optional' if you dig deep but massively encouraged by MIL. Very, very strongly encouraged. She has been going to camp for 4+ years and every year has homesickness problems, last year bad enough camp wouldn't work through it with her (plus 11yo at the time SIL was completely distraught and unwilling) and she was sent home.
Camp was strongly encouraged again this year, discussions were had about how this time it would be better (because of various reasons, some likely very true!) and SIL agreed to try again. She is excited to go and is looking forward to this year.
MIL and her DH have booked an abroad holiday while SIL is at camp and have not told her they are going, and are going to quite extreme lengths to maintain the lie (eg. telling SIL she wont be able to send her photos of home because 'camp have asked parents to NOT communicate with campers about home, to avoid homesickness'). SIL is under the impression they will be 2.5 hours away in a car, not 12 hours and various transport methods (flights, taxi's, possible hire cars) away - that would be a very best case scenario, an unplanned trip home could easily take them 24 hours.
They have not asked anyone in the family to be available in an emergency so I expect they are banking everything on it going well and assuming if it goes wrong, it'll go SO wrong that someone will jump to help anyway.
I think using the time for a holiday is a great idea but that lying to SIL about it is utterly abhorrent, I think it's a fundamental and pretty intentional breaking of trust with a child still young enough for it to have a pretty big impact. Especially if she finds out while already very distressed that her parents are actually not even in the country. OH agrees - though put up with similar forced excursions in his childhood so is less incensed than I am.
I am completely unaware if the camp know they are going abroad - though they will have OH's info somewhere as an emergency contact.
We are pretty sure MIL IBU but I was a massively sensitive child with regular homesickness and various trauma issues and I have lost my objectivity. Is this less of a big deal than I think it is?
(OH and I are adults and OH will of course go and collect her if the need arises - though isn't thrilled nobody actually asked him.)