OK, we have DCs 5, 3 and 9m. We have a double airbed (DP and I both hate it and are up for a change), a single airbed, an ordinary travel cot and a single SIM. And a tent with 2 bedrooms.
The 5 and 3yos will happily go in together but would wake up the baby if she was in with them. Baby's a light sleeper so not mad keen on having her in with us. Have borrowed a Little Life baby tent thing in the past but no lomnger able to do so.
We're up for new kit but not got many £££s. Double SIM for us and double airbed for littlies and baby in main tent part in travel cot? Never tried a SIM - are they really that comfy? Gah, brain hurts - what would you do?