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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.You just have to teach someone else and that's it. If they don't understand it then just take note of it on a simple explanation and up to them how they will able to understand it. Once you left this world (knock knock lol), given that you already gave them some informatoin about your concern, they will push themselves to know what those really are and I think they will get an assistance for other persons.
Just be sure that their effort will be worth it and not at the end of the day, they will just saw a BTC0.005 stored coins. lol.