What if he has different wallets and decides to show them the one with little coins inside they will still not be contented with the amount they will see there as they will feel that he has mismanaged his funds.
He should be the one to explain it to them. Contented or not contented that is not a big deal in my opinion, even if they are disturbing on what he’s doing to make money or they think his misusing his funds, after showing them the wallet in which there is no much coins is still fair and they suppose to believe him since his not earning compare to them. They earn more than him, so he can tell them he used some of the funds to meet his needs and necessary things that he needs to do.
It's not advisable to declare all your bitcoin hodlings to anyone by force be it your family members. What of those his brothers that are into physical earnings, did they declare all their asset and funds in the bank to the family?
Exactly. What we need to understand here is that no one will declare all their assets to the family members, and that is why I said it doesn’t matter whether they think he misused his money or not; what matters is that he shows some part of his holding, and that is enough to say he has something in his wallet; you are right. They also did not show all they have to the family members.