J.P.
If I am understanding this correctly, the question here is the sleeping arrangements for this upcoming visit? I would say ask the person that you are most afraid of upsetting. Your youngest may not have a problem with the sleeping arrangements, it might just be the guy, as he doesn't really know him yet. Is the BF willing to have a cot in the livingroom? Or maybe your son would like him to stay in a hotel so that he can have some down time from him, maybe he is okay if you stay in the same room, or both at the hotel. 16 isn't a child, and I really think that you need to talk to him. Let him know that you really like this guy, but you don't want to make him uncomfortable either. Ask him to give the guy a chance - a real chance.