It depends on your agreement with him. If he is paying rent, providing his own liability insurance and operating his own business in your facility then standard practice is to allow him to continue using his own branding. However, if you are setting the prices, processing payments and paying him out then he would be acting as an employee of yours and thereby under your umbrella. I would also suggest looking in to your local (city or county government) requirements for business licensing and EED regarding classifying him as a contractor or employee. Best of luck!