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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And I've been thinking about it considering the present way of life literally every day can be the last one.It would be really bad that we leave possible wealth behind us and that nobody knows that such a thing even exists.
It would be wisely to write a letter with detailed explanation about cryptocurrency,wallets,private keys and store that in some safe place.Only problem is
to ensure that no one gets it for our life time.Safe deposit in a bank is maybe good choice since they will give content to family when you passed away.
This is something we all should seriously consider,it is not paper money,gold,house or something like that, so it is difficult to safely leave coins in inheritance.