To add another layer: It could also youself who might need such an 'cheat sheet': My dad suffers from an previously undiagnosed heart problem which escalated pretty badly last year, with a multi month long stay in hospital, coma etc.. He is now back and well, but time in a coma can do bad fuckery to your brain, in part to ones memory... He simply lost some significant parts and now he is pretty good occupied untangling the 'insane security fuckup' (his words) he had constructed around his passwords, bank accounts and investment schemes...
So... keep it simple and be NOT the 'Family patriarch silver back' who is the only one who has full knowledge ;-)
A similar situation can arise under duress. On the contrary to what people claim online, in dangerous places you want to cooperate with criminals, not get in between them and your stuff.
Under that type of stress it's very easy to forget passwords which might make criminals believe you're not cooperating. Having some things writen down (probably not all?) has come in handy for me personally.
yeah, long story short, I was unfortunately kidnapped in Caracas 13 years ago. Thankfully everything turned out "fine", a ransom was paid and I was released.
But, in the middle of the ordeal and panic I had to give them access to my car which had a security code to be able to turn the engine on. My family had prepared for this (the reality of the city at the time) so we had the code writen down somewhere in the car. I just gave them the piece of paper to avoid errors or hesitation as I was quite nervous, I didn't want ANY mistakes :/
Wow I had not thought about losing my own memory. This is my first step in untangling that mess that I have made whole also reducing dependencies on myself.
So... keep it simple and be NOT the 'Family patriarch silver back' who is the only one who has full knowledge ;-)