Hi I would suggest screening. For me I'm an adult with kids. I play and my daughter plays. I screen who I play with because I don't like a holes and I don't play with kids because I generally find them annoying. On the flip side you need to screen who your brother plays with. I would suggest just allowing him to play with kids and preteens but that's my opinion. Good luck. I play on PS4 and fortunately I haven't come across too many idiots but I hope it goes better for him