Help please social worker friends.

I live in VA. I am wondering the laws of children sharing a room. I have 2 boys and 2 girls ages 5(b) 6(g) 12(g) and 14(b). Can they share a room? How many kids can I put per room? And could my mother share a room with 2 of them? (The girls) or could one of the smaller kids share a room with me as long as they have their beds?