Kern County Mineral Sales

I thank you for this topic. I’ve been thinking about my mothers rights. They were my great grandmother’s and grandfather’s from the 1930s. Unfortunately the land was sold, the distribution of trust split 500 acres between 4 sisters(my grandmother). My mother is an only daughter. They were leased for numerous years by various companys. All the paperwork is here somewher as gram kept everything. They have not been put in my mothers name. Any help would be appreciated.