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?
It was not a wrong move to let any of your family members know what you are doing but when it comes to the private keys or any information that will risk the safety of your investment or whatever it is, better to disclose it to them. Besides, it was not necessary unless you feel like you can't handle it anymore due to some health issues. As you know that money is tempting, but people become evil when it comes to that which is why you should be careful with your keys just for that sake. You can tell them about Bitcoin and nothing else.