Shares of a Deceased person

My friend recently found physical share certificates of Reliance Industries which were purchased by his father in 1988. It has already been more than 20 years since his father passed away.
Does anybody know the exact steps to be followed to transfer these shares to his name? Also is it possible to get all the corporate actions since 1988?

The documents he has

  1. His fathers will stating him to be his legal heir
  2. Death certificate
  3. Share certificates.

You can check out the process mentioned here, and he will be eligible for all corporate action benefits: