From what I could find on Zillow, most of the houses on that block have side apartments so it’s possible Bonnie lives in the side apartment & Raven lives in the house, the girls have the rooms and Corey probably stays in the first floor family room. Also if you look at pictures. They don’t use their garage to park cars, so maybe that’s been converted into extra room. I don’t take Tracy’s word for Corey sleeping on the couch, he’s been there over a year and Raven has been renovating it.
It’s also super common due to the outrageous pricing for rent, a lot of people are multigenerational living now, especially in SI. Eventually Corey will probably move out, but if Raven isn’t forcing him out and he’s helping with renovations, I don’t see him leaving anytime soon. For what Corey needs, it’s almost unattainable at this time. Unfortunately we don’t know the Epstein side because they’ve basically remained quiet and have let Tracy hang herself out to dry. I can only go by guessing and being familiar with the area they’re in.