3 generations holiday in cottage complex thing
Mum and Dad (one double room)
DD1, husband and 2 kids (one double, one twin)
DD2, husband and 2 kids (one double with cot, one single)
DS no kids no partner (one double)
How should the cost be split if they're all sharing one house?
Should the cost be different if they have to split across 2 houses (ie. 1 DD2, husband and kids in one house; rest in other house)
Does it make a difference is DS is in a single room instead of a double?