I wouldn't blame the man here for doing such and i wouldn't also want to interfere to the matter that arises for the separation of them both, but in dealing with bitcoin, we can see that it's a currency that is decentralized which means only the person owing bitcoin can have access to his asset without any third party knowing about it, if he thinks he trust and love his wife or children, he may decided to share his keys with them or let them know that he's having a bitcoin investment.
As long as he's not using a centralized exchange, they can't apprehend him or know about his bitcoin investment except he once told his wife or she already knew he is into bitcoin, if the court knows he has an asset in bitcoin, they can't do anything to force the man share it into two because they have no evidence that he has such, bitcoin is a p2p network except the man is willing to give her from his bitcoin investment.
The conclusion here is for everyone to know what he's doing, know whom you're married to and know how to secure your privacy incase of situations whereby you wouldn't want anyone to know about your worth or investment at hand, as long as you have the keys they coins belong to you and no court or government can cease your asset from you.