Er, it's not illegal
For two or four or even twenty kids to share a room, whatever age and sex they are. All it means is if you were on housing benefit you'd get a higher rate for an extra bedroom requirement.

Interestingly the threshold for this is much lower than the threshold at which the council will admit you are overcrowded. The threshold for overcrowding has not changed since 1935, and counts living rooms and kitchens as well as bedrooms.

But even if you are considered to be legally overcrowded, there's not a lot they will do about it. They're not going to put you in jail for living in a small house, FGS.
(Marmite Omelette ...but I feel better having screamed, don't you?, Wed 2 Jun 2010, 22:27, 2 replies)

I
was under the impression that a male and female could not sleep in the same room after the age of 12.
(dchurch bah, Thu 3 Jun 2010, 7:45, closed)

that's what I thought
I am pretty sure that I shared a room with my brother and sisters when I was over 12 - sometimes we still do share rooms when visiting family!
( ascorbate, Thu 3 Jun 2010, 9:35, closed)