My father granted use of his land to someone without any signed agreement. The person hired a crew to harvest Hay, treat the soil for planting, remove some trees and do minor landscaping; all with my fathers permission. My father is not compensated, nor did he request compensation. He has also granted full use of his barn for storage of their equipment. He's elderly and just wants to see the property being used. My question is, if he decides tomorrow that he changed his mind and no longer wants his property to be utilized, will this person have some legal rights to demand compensation for his labor and time? I told my father I think he would have a right to some compensation if he proves what he invested in his land. But I'm not sure of that; so I'm asking smarter people than me. Thanks!