Tracy - did your cousin leave any clothes behind that smell of him? Or a blanket from Bear's old home? If not, get your cousin to wear a sweatshirt or similar for several hours and then give it to you so you can put it behind the sofa with Bear. I'm sure he will be fine but I'm afraid that, in spite of your space crunch, he would be best in his own room where he can be free from everyone's presence while he eats and uses the litter box.