See Will from 1975, determine is will being upheld or false transfer occured?

My sister and I are sole heirs of our father. He and our grandmother promised us for entire life we would inherit 63 acres of family land that our grandfather supposidly placed in a trust that could never be sold, just hanbded down through the generations. Our father died two years ago, when we asked about the land we found out that 1 year before his death he and our grandmother tranferred ther land to his uncle. No reason was given. Dad was ill, grandmother has no recollection of it happening. We are wondering how to acces the original will to see if it has been violated or how to determine if an inproper transfer occured with people who were not in a codnition to make that descision