You just said a will can be written, WILL contains everything you have, properties, money and so on, if money can be included why not Bitcoin? Anything can be WILL to your offspring.
You don't have to hide your involvement with Bitcoin from your children and wait till you are no more around before they know, teach them about Bitcoin while you are still here and pass them the Bitcoins you want them to have, there are ways you can get this done, I believe we have discussed something like this on this forum.
If your kinds are still very young, wait for them to get to a certain age, you have a wife? Teach her if you trust her, you have to do so because you don't know when your time will be up, if you are not around anymore she will get things done and fulfill your desire.
Get your kids hardware wallets each and send any amount, for example 1 BTC each or lower.
Lawyers can get this done, so is your spouse if you are scared of Death 😁😁
But I do believe that there would be more husbands or men would be trusting up their lawyers on storing up their funds or having that will rather than on trusting their wives.
Even myself cant really be just that too confident on sharing up my wallets private keys into my wife specially i have saving up in secret and i dont really like for these funds for it to be accessed on the right time.
Not really that on being too selfish but i cant really just that able to freely them able to access my wallet on which these funds been saving up on the right time that they would be able to benefit.
I cant really just that be too confident for now but time will come that it would really be that come in to use. We are all afraid of death and it is really just that right that we should really be making out
those back up plans so that the coins that we are trying to save wont really be coming into waste and this is why its always been ideal on what are the ways that you would really be making use of.
Whether you would really be including it on some will or those recommendations using up LoyceV's suggestion which it isnt really that bad either.