Molly/Arthur
I don't think that would be a wise game plan for them.
Does he really want to hole up in his room with the ghoul? We have our "Ron" and if it comes out that is not the case then he is off to Hogwarts or worse. You know how that would go for him, interrogations about what he knows of Harry and Hermione. I want him home, but this is probably for the best.