My plan is using Shamir’s Secret Sharing (https://en.wikipedia.org/wiki/Shamir's_secret_sharing) to split my encrypted master password in 3: one for my wife, one for my mother and one for my best friend. In case I die, only 2 of those parts are needed to recover the password.

Would you mind taking a look at this issue? https://github.com/mattogodoy/nametag/issues/15 I’m planning the implementation for CalDAV/CardDAV and have a few high level questions I’d like your opinion on. Thanks!

It’s on the works!

CardDAV synchronization is next on the list of priorities :)