My grandmother's old farm was passed on to several heirs who then passed it on to their children. The farm was originally split many ways, and then split even more when the second set of heirs got their split. Obviously there are many owners of a portion of the land. However, the controlling share is owned by a family member and she sold only her portion of the land. The other heirs still own their shares. They are now upset and threatening to sue. Do they have any legal standing? My family member is stressed about it and I'm very concerned about her health!