The only one who know my coins investments, wallets, private keys, is me. So the question is how to inherit this information to my family? to give them privilege to access it after I passed away 
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.Contact some lawyers and get it sorted. If you are worried about them stealing it go to a well known law firm which deals with millions each day. They'll probably not even blink a eye of how much you have as they see tens of millions each week.