You can inform just one member like your parents or wife about this so that they can recover the funds in case anything happens to you but never tell this information to casual friends or distant relatives.
Tbh not even people that are part of my contingency plan in case something happens to me don't really know how much in crypto I have and you simply don't share that info around (I can understand telling your wife though if she asks).
How can a kidnapped person can escape and told the police about a criminal in his home?
Maybe kidnappers were amateurs (and probably are as they were his "friends") that made a mistake and he managed to escape, and who said that they were still in his home when police came? I don't see it as very unlikely to happen.
businessman or an average person doesn't learn self defense since they're only learn about money management and investment. I just imagine a person who get kidnapped or $5 wrench attack, they must tell the private key or seed phrase to the criminal since he will scared and think his life is more important than money.
Since he said that funds were recovered, it probably means that kidnapped person eventually gave them bitcoin, and after police arrested them they managed to retrieve it.