Mobile homes sitting on property owned by someone else simply mean the mobile home is considered chattle.  It has no bearing on the ownership of the underlying land; think of renting land in a mobile home park.  As to what can occur, if the mobile home is taken as a result of a repossession due to a foreclosure on the loan, then those who come onto the property have the same responsibilities as repossessions anywhere else. They cannot damage the property on which it sits.  As to storage fees, unless the mobile home owner had a rental and storage agreement with the landowner, storage fees cannot be charged.  As to the paper signed when the mobile home was first placed on your mother's property, you need to see what the document stated and whether it was recorded or not.