Is it necessary? I don't mind him living at home; I just worry about what will happen to him when his parents are gone, especially if for some reason we die relatively young.
I meant as a long-term situation that would give him a social support structure for when you are gone or can no longer provide for him. I see now you mentioned in another comment you wouldn't be surprised if he ended up living with his sister at some point and that she lives close to you, so if he has that option that might be the best.
