Legal Heir/Varisan Certificate - Gurugram

A friend in Gurugram HY is trying to get a legal heir certificate (Varisan) after the death of his parents (intestate). He contacted a lawyer in the District Court and was told of the following process - a) Lawyer will prepare a file with application, Aadhar etc. 2 witness details also needed. b) The legal heirs (siblings) will be photographed in tehsildar's office. c) Then the legal heir applicant (my friend) will take the file for attestation to local councillor/corporator/Parshad/पार्षद and to patwari/nambardaar (nobody seems to know where the local patwari is, though). d) After attestation the lawyer will complete formalities at tehsildar's office and hand the certificate to my friend/applicant. Some other people have different opinions, saying there should be no intervention of tehsildar and attestation by going to patwari etc. But, yes, a govt. official will call (even visit applicant's address) to confirm details. Another opinion is that one should take the legal heir application straight to the city's District Magistrate [no tehsildar etc] and his/her stamp/signature will make the application a legal document valid all over India, at least. May I know from the esteemed legal practitioners here what the standard process is or if the process varies from place to place? Any tips on how best to go about this will be appreciated.