You just need a piece of paper from a crematorium saying they buried such and such a person. Crematorium workers don’t earn much so if you bribe them sufficiently you will get it.

You use it to apply for death certificate. And that’s about it. First hand experience.

I think aadhaar card copy is needed but it’s not difficult to obtain especially if you know the person.

You just have to bribe someone in the govt and get the death certificate.