Passing on Hardware Device to Kids

For those with a hardware wallet....what is the best way you are preparing for in case of your sudden demise or you are incapacitated from an accident? Like for instance leaving your seed phrase some where with the directions on how to access a device...this would be for young kids for when they grow up and can access the coins...I dont want to leave the device or seed phrase in a bank safety deposit box. Are you putting your device with the seed phrase itself? Guess that wont matter in lets say 10-15 years the USB cord or bluetooth is replaced by something else