Grandparents Raising Children Support Group
This community is dedicated to grandparents who are the primary caregivers of their grandchildren. In cases where the parents are not willing or able to provide adequate care for their children, grandparents may take on the role of primary caregivers. Join the support group to find support, share your experience, and get advice from other members.
Will you be a legal guardian or just a hotel? Does he want to move in with you? My guess would be if he wants to move in at the age of 16 he thinks you will be a push over and provide a bed and food and he will do whatever he wants.
Regardless at his age I would have a written contract with him detailing your house rules, IE he must go to school, he must maintain his grades, he must work, no girlfriend in the house without you present, no sex in the house, chores etc. Detail it.