My great grandfather owned 100 acres of land and when he died it was split between my grandfather and his two brothers. When they died the land was given to their children. My mother, aunts, uncles and their cousins pay taxes on this property every year. One of the cousins took a trip to South Carolina (which is where the property is located) and realized some of the property is being lived on and some has been sold. Before my great grandfather died he remarried and it is her family that has taken over this land and forging signatures to sell it. What can we do about this? Where do we start?