Usually the authority/official/office under whose jurisdiction property falls say Patwaari, have duly prescribed procedure in case a WILL is presented:
And accordingly, can ask for certified copy of the WILL, death certificate, Legal heir certificate, NOC from all (other) legal heirs, ID proofs, advertisement in newspapers etc etc ………………….. before transferring ownership in favor of beneficiary.
If authority per applicable procedure accepts then ownership is transferred on the basis of duly acted upon WILL and entered in mutation records (say Fard).
If WILL is not valid or contested it may land up in probate court.
You have posted that you have never signed the NOC in case of WILL by your grandfather.
Apparently your father was alive at that time and he never signed any NOC.
If the WILL was acted upon in some fraudulent manner you can contest it.
You may obtain the latest fard and all, linked documents from O/o authority/official/office under whose jurisdiction property falls say Patwaari.
You may better approach a very able counsel specializing in Property/civil matters at our location and show all docs on record and inputs for a considered opinion.
As it can be guessed from various threads initiated by you: You have hostile relatives and if all efforts for an amicable settlement have failed then it seems that you shall have knock at the doors of court of law.
