Likewise it happens for the property to devolve from your Grandmother to her legal heir.
Obtain certified copies of mutation record with link docs.
The local revenue official e.g; Patwaari can help you.
Once all docs are in your hands you will know how many legal heirs are involved and all are coperative or not.
Mr. G.L.N.Prasad has alredy hinted you on it.
Agreed with Mr. G.L.N.Prasad.