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 😁😁