Pass on my stack

From my family, I am the only one who understands and stacks BTC like crazy, no one else literally bothers, they don't even know how much I hodl (for obv reason, I never share that with anyone), but my concern is, if something unfortunate were to happen to me, like permanent brain damage or death or something like that, my stack basically becomes inaccessible.

How am I supposed to ensure that someone from my family gets access to my stack if I'm gone ?

No one is open to being educated, at the moment.

Any suggestions are greatly appreciated.

Thanks in advance.