Over the years many top investors in bitcoin and other crypto assets has lost their lifetime fortunes because they failed to disclose most of their investments and other crypto assets  to their loved once due to reasons best known to them,  however every investors is mandated to have a next of kin that knew of their Bitcoin investment and it secret phase so that in case of any eventuality, no body is praying for bad things but if something we never prayed for  happens, who can access our asset (funds) ?
It Is a crucial question we should be asking our self.

I know a guy in my area that suddenly became mentally deranged and that guy was a huge investor in bitcoin investment but funny enough nobody knows the pass phrase of any of his wallet or any of his crypto assets,and  his family was in bitter need of money for his treatment and welfare and non can access his funds because they are ignorant of any of these, so I kept wondering if an investor can invest in bitcoin for a long term plan without disclosing to any of family members? 
Is it  proper  sharing your pass phrase to your family members?