100 share certificates? RIL is a listed company- those shares have now been dematerialised. the current value of RIL shares is roughly INR 2.4K- Depending on value of share, if the shares' value exceed INR 50 lacs, which is possible if a share certificate pertains to multiple shares, obtain a succession certificate from the District Judge. For less than 50 lacs, an ordinary indemnity bond might suffice. All depends on which demat you are dealing with

Check with the demat bank if your uncle had nominated your aunt as a beneficiary. If yes, the bank will give you step by step instructions for the transfer. If your aunt does not have a demat account, she may have to open one.

Pl contact a local district lawyer. While the procedure is fairly simple, getting things executed on the ground may be tough.

Your aunt may file a petition before a civil court for grant of succession certificate. All debts and securities owed to your deceased uncle will be covered by the certificate.