Mum: if she passed away and I found her porn I’d simply burn/delete it for her privacy.

My other parent (already dead): no idea. My first instinct would be to carefully select the nastiest bits of it, and then make sure that his family (technically “my” family too, but… meh) knew about it. But on a second thought that piece of trash already kicked the bucket, I wouldn’t be harming it but rather upsetting common relatives, so… why bother? TL;DR probably burn it too.