Another way to keep your coins from being stolen is to use a cold storage wallet. While they are not a convenient solution for spending bitcoins, they are a great way to keep your coins safe. -snip-
-snip- In that screen he kept his private key. -snip-
So please don't get know anyone about your private key.
Except for the heirs?
I think to protect the private key is better to use a hardware wallet. Hardware wallets are also more resistant to viruses, malware, etc.