I think the most important lessons for kids aren't necessarily about Bitcoin, but about responsibility.

I'd start with the basics: personal finance, money management, and the difference between 'Easy' and 'Hard' money. It might sound boring at first, but if the learning is hands-on, like managing a small budget or earning sats for chores, the lessons stick.
Once they understand that money is just a way to store their time and effort, Bitcoin will make sense.