I use a password manager (PM) and it has the facility for my AC to get access to the PM, should it be needed. I have to nominate my AC then, in the event of my death or incapacity, they can apply for access. My PM contains details of all my online activities, I make additional notes, answers to security questions, account details etc. within the application. The PM generates complex passwords too, then saves them. It's all encrypted.
The PM is clever and well thought out, and my AC cannot get access while I can answer emails. I can also retract permission if I want. I can also share individual passwords with anyone I wish without my them knowing my master password.
PMs aren't always simple to use but are invaluable. Not all PMs have the facility for sharing securely. I pay for my PM but, with 100+ unique passwords all protected by one password only I know, it's very secure too.