Overnight/ sleep over beds

As long as you have a bed for the parents, I would just buy cheap sleeping bags for the children. Children are usually happy to sleep on the floor.

Really depends on how often you would use them. Beds aren’t cheap and Children grow out of them very quickly.
If visits are infrequent Children can easily sleep wherever you put them. On the floor with a mat or mattress or cushions, maybe borrow a cot if you can, or top and tail. Hope all goes well.

Do you mean these, lots on Amazon and probably Argos. My grandson had one when little, and he loved it.

Also, if you buy inflatables,, give them a good airing a few days in advance. The smell of new ones could make the little ones ill.

Go to Argos and get a couple of double airbeds and some cheap duvets - sorted.

Search for Readybeds.

Also I have seen inflatable put-ups for kids here in Germany that are like a paddling pool but the bottom is also inflatable. But then you would have to provide the bed linen and the Swags and Readybeds do include the sleeping bags. (no idea how you wash them)

If you get something inflatable, get a decent pump - you don't want to spend lots of time and energy pumping with a simple pair-of-bellows-style pump.

We had an inflatable mattress for visitors. On the first occasion
the couple using it had an unfortunate experience. The large lady managed somehow to sink the mattress to the floor while her slimmer husband was peacefully sleeping on his nicely inflated side, up in the air!

Can you borrow something? There are bound to be plenty of people who have cots in the loft. I take it the youngest will still sleep in a cot. The others may manage on makeshift mattresses.

We settled for blow up beds on the floor. The other option is to have them stay off site in their own accommodation.

Another thought - invest in a tent for the children. Obviously not for the present but for when they're a bit older.

Or put the adults in b & b.

I remember when staying with cousins when young that we topped and tailed. Surely 3 under fives could do the same?

I bought a self inflating 'blow' up bed a few months ago, on ebay, called 'Aveenii'. Expensive but comfortable.

Autocorrect - swags not swabs!!

AKA Swags

Commonly available in Australia and I think available in the UK too. I just had a look on Amazon but they're out of stock and not widely available elsewhere. Proper swabs are very expensive.

Air beds with sleeping bags could be an alternative.

We had some of those when my grandchildren first came back to live in the area. They were okay for the first night subsequently they developed leaks and deflated during the night. Going g on our experience, I wouldn't bother.