I was listening to a news that one of the relatives of a person kidnapped him and asked him for bitcoin in ransom. This happened because that person showed his bitcoin holdings to many of his relatives and news spread among them that he has lot of money invested in crypto. Though, finally funds were recovered from that guy but he could have even lost his life in the whole scenario. Thus, you should be careful with disclosing about your bitcoin holdings to everyone.
I think this should only apply to crypto hodlings. Generally, it is a very risky thing to flaunt your wealth. Not everyone is happy with you and some will be looking for ways to sell you out to people who could harm you and try to take your wealth.
What is the point showing his entire family his portfolio? Was he trying to convince them to invest, or just for show off. Whatever his reasons are, my take from his experience is that one should be careful who you show sensitive things about you to.