Our neighbor is trying to take a piece of our property via adverse possession. He told us when we moved in (3 years ago this October) where our actual property line was. He has mowed the grass on our side of that line for 14 years. He also has his propane tank on our property in the section in question. He claims the person who lived there before him mowed the grass in that section as well. Does he have a case to gain this property by adverse possession?