Shared custody?

Boyfriend and I are talking about getting a place this summer with his cousin as our roomie. It would have to be 2 bedroom and allow dogs. Roy loves Henry and knows he's part of the package, but I'm a college student living at home and my parents are very attached to Henry also. I would not want to give up 'custody' of Henry and leave him full time with the 'rents, mostly because he's my boy, and I trained him and do all the exercise/care. I'd live someplace close enough I could still see mom and dad a lot, so I'm wondering if any of you have worked out a sharing arrangement with dogs before. Like Henry could spend weekends with his nana and poppy lol. What do y'all think?