Request for mutation of inherited property based on non-judicial decla

My grandmother (Dadi) was the sole owner of a piece of land, though at the time of purchase, both my father and uncle (chacha) were mentioned as nominees, not co-owners. After the purchase, in 2022, my grandmother executed a non-judicial declaration (with thumb impression), clearly stating that she wanted the property to go to my father and me. This document mentions both our names and excludes my uncle. My grandmother passed away after executing this declaration. Currently, I hold the original