Take it to the grave?

A family member recently passed away and it got me thinking. When they passed away, they took all their passwords with them, including any alt accounts they have.

Would you take all your accounts, real and alt, and passwords to the grave or share them with someone on your deathbed? Think about all your accounts (Disqus, Twitter, Instagram, Facebook, Pornhub, xhamster, hidden bank accounts, etc).

And going beyond just accounts, what if you had a hidden stash of something, would you also reveal where that is?