If you don't tell or give hints about your Bitcoin to any of your family members/relatives and you die, your BTC will be lost forever as no one will have access to your wallet. What i have suggested all of my friends to solve this problem is using a pendrive to write down all the keys of their wallet and how much assets they're holding. This will help his family members to get back all other assets after his death.
Not your keys - Not your coins. BTC is just like gun, the owner is the one holding it. Its because of this feature that I have shared necessary details of my BTC holdings with few of my family members who I trust the most. I read that there are many BTC's abandoned because owners lost the keys or owners are no more in the world.