Pssshhh. A suicidal teenager's ghost is fairly easy to keep out of the house.
Unless he wasn't really suicidal, but got killed, and you're his large-breasted, red-headed, slightly crazy little sister. But then you shouldn't worry, since the tall, athletic guy that you've had a mutual crush on for a while will come and exorcise your big brother when he's gone insane and tries to kill you from beyond the grave.