To try and fit 9 kids into 4 rooms?

[upsideup]

No we dont have 9 children, only 4 and they each have there own bedroom normally.
But next month we are going to have to look after DH's brothers and his sisters DC for a week, difficult but we are going to have to make it work.

We have:
Bedroom 1 -double bed
Bedroom 2 -double bed
Bedroom 3 -single bed
Bedroom 4 -single bed

• 1 single mattress, Double airbed and 2 single airbeds (double can only fit in Bedroom 3 and potentially 1 single bed could fit in bedrooms 1,2 and 4.)

Our children - DD3, DS4, DS8, DD10
BIL's - DS11, DD15
SIL's - DS2, DD10 and DS13

Me and DH are finding it impossible to allocate the rooms is the best way.
We know this isnt ideal having them all sharing but it is what has to happen and it is only for a week so would appreciate your suggestions on how you would do it?

Realised this post looks quite a bit like a maths question (its not)

My cousins had 11 children in a 3 bed house.

I'd take myself and DH off to a hotel for a week and leave the 15 year old in charge!

Thankyou for all your help!
Spoken with DC now and DS8 would want to share with DS4 and DD10 wants to share with DD3 and theyve said they dont mind squeezing into one room if they have too.
I think we can make it work especially if we put some of our DC in our room and use the downstairs for beds that our nieces and nephews can get somewhere to themselves if they want because its going to be really disruptive for them and they will probably all struggle to sleep otherwise.
I think theres going to be a lot a bed switching over the week regardless and are next problem is going to be sharing 3 bathrooms between 11 people.