First is this contract recorded at the county govt center ? second Does the written contract with the tenant buyer grant to granny any area of the property via reservation to her to store things say like in sheds garages a basement room ? When a landlord rents to someone a home unless the LL has excluded in writing a area such as sheds barns garages areas of a basement from tenant use by clearly listing the area in the lease then the tenant has every reasonable right to expect to have the full use of every inch of the yard , all garage spaces, all driveway spaces, the entire basement and any and all other outbuildings So are there any areas excluded from tenant use in writing ? if not I suggest granny get her things off that property. ( ask her if she understands how bad she could look in court by first trying to make a tenant clean up /organize a property when the tenant can easily show the LL has denied them full use of the property ( which also could be spaces the tenant should be able to use to store tenant property since they are paying for the space but denied by LL refusal to move LL property off site and being able to show the court there are no excluded spaces listed in the lease )