My dad unexpectedly passed away recently, and there were a lot of problems because we didn't even know his phone unlock PIN (to be fair, he did told us several time, just that none of us bothered to remember). But one of the main problems is that tons of research fund is tied up in my dad account, so it's basically frozen until we can execute his will.
My mom manage my dad tax return so at least we think we know where all his money and debts are.
This event prompted most of my dad co-worker to create something like this cheat-sheet.