When it comes to bitcoin wallets is totally a kind of private pants for females and boxers for male. Bitcoin wallets is like ATM pin which is assigned to individuals which banks do not respect another person on your behave. Is personal identification number, that's what bitcoin wallets, private keys and seed are. But to some point because of love, trust and spouse lips, we give out our details freely for this person to access.
Can we also show our bitcoin key to someone closer, maybe love, spouse, next of kin?
Better still between someone; who introduced and taught you about bitcoin, a friend or family member and your children who's most preferred and reliable person to give out our information about your bitcoin?
We all should share our private keys with anyone no matter how we trust a person that's the general rule I mean it's privacy and you're the only one who should have control of your own wallet, but it doesn't really matter since its still your decision if you really trust a friend or your family you could easily give it to them anyway, when someone is teaching you bitcoin they should not know your private key they should tell you that your the only one you should know about that private key if he wants to know your private key that might be an issue because he might get your bitcoin in the future, he might have a plan already to steal your bitcoin in the future that's why he's teaching you how to invest or buy bitcoin.
I would understand giving your private key to your family since we need someone to inherit our bitcoin, but I wouldn't give it to them easily, I'll just write it down on a paper or notebook and then tell someone in my family who I trust that I have a bitcoin wallet.