I have two 6- and a 9-year-old sons. They live with their father. I have found out that they share a bedroom with their 18-year-old step-brother there. The 18-year-old plays videogames rated 16+ and 18+. Their father allows our boys to watch him play these games. And their father messaged me that he isn't stopping his 18-year-old playing this sort of games. We are going through courts to get my boys with me. At my house we have my boys staying over for the weekend and we don't allow them to play or watch such videogames.
Is it okay for an 18-year-old to share a bedroom with 6- and 9-year-olds? Is this allowed in the UK?