My sister has done something similar and it works, although it has been stressful at times, due primarily to NOT setting parameters in the beginning. I would definitely recommend laying out rules and responsibilities (buying your own groceries, laundry soap, making sure everyone turns off lights when they leave rooms, etc.). These things can become stressful quickly or they certainly did with my sister and her situation. They've been able to work it out, but there was some drama there!