If we got a room with a trundle, do you think instead of the trundle, there would be room for us to inflate our own double sized air mattress? That way we could give MIL a full twin bed to herself? She's saying she 'can't' sleep in a double bed with FIL without straining her back. But this way she could have her own bed, FIL and DD could sleep in one bed, and then DH and I in the air mattress and DS *hopefully* in his pack in play. (He uses a toddler bed, so it should be interesting!)
6 nights in the same room as MIL. Let's hope that We run ourselves hard so I pass out super quick every night!
Have you not considered two rooms at a value instead? this sounds like TORTURE to me!!! (and i adore my mil! we are bringing mil/fil w/us this year, but we are doing three rooms... one for dh/i/toddler, one for our two teenaged kids, and one for mil/fil) You should seriously reconsider if it's not too late!