Ex and I have been separated for a few years now. When he first moved out he stayed with a friend and the kids didn't stay with him as there wasn't space and I don't really think it is appropriate when he doesn't have his own space.
He then moved into a 1 bed flat and the kids started staying with him every other weekend. Still far from ideal as the youngest slept in the double bed with him, one on a blow up bed on floor and one on sofa.
He's now moved back in with his friend and rents a room. He and the three kids would all be sleeping in the one room together (they haven't stayed over yet). Whenever they have been there they all come back having played computer games and watched films that are not appropriate for their age (they are 6, 10, 14). His friend does not have kids and spend most of his time watching violent films and playing 18 rated games in the living room, so I don't feel it is appropriate for the kids to stay there.
We just have an informal arrangement that the kids are with their Dad EOW, there is no court order in place. What would you do in my situation, would you let them stay over or try to sort other arrangements.