There are multiple ways to extarct bits of info:
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For mutual funds not held in demat format, use this
https://www.camsonline.com/InvestorServices/COL_ISAccountStatementCKF.aspx -
For MF/shares in demat, you should be able to retrieve details from CDSL NSDL. If the deceased had a registered email address that you have access to, then the consolidated account statement (CAS) would already have been emailed there periodically. You can also check the FAQs here:
Edit: Looking at the response from @VenuMadhav , I am not sure about the legality of accessing a deceased person’s information without documentation. The two ways mentioned above are the tools that I use to track my financial investments and may be of relevance to you.
Wish you all the best.