Hi
You have misunderstood about the registration for the transfer of your late parent's property in your name.
There is no need of registration, you are already the only heir/legal owne rof the property which you inherited from your parents..
If it is a landed property , approach your tahasildar/village office and apply for mutation in your name
you will have to submit the necessary documents to prove your heir ship as the only son of your parents.
the documents :-
death certificate of your parents, family ration card,your birth certificate if any , your identity and address proof and the revenue tax paid receipt of the property etc.
Since you are the only legal heir, you can directly get the village registry entry in your name, which is called as mutation , this means the name in revenue records of the property owner will change into your name.
There is only a nominal fee , no court fee has to be paid.