I think it is a great idea to start teaching kids about cryptocurrencies in general and bitcoin. However, it greatly depends on the age of the child. I would suggest first teaching kids on how to properly save money as well as spend it. This would have to be the main focus as these are the basics of how to properly use any type of money. I do not think that primary school kids should be taught in cryptocurrencies, but high school kids - definately. Cryptocurrencies will turn to become the main transaction method one day, so why not get a head start?
It's complicated for children to know crypto currencies, they have to know the basic or what really the world is adopting now
so they can compare and be responsible when using bitcoin. They will eventually learn once they are matured enough because if
they understand they might make bitcoin as their passion.
And we all know that it is impossible to be understood by small children, they will not understand the basic foundation of bitcoin, they will not understand fluctuations, segwit, hard fork, etc, even it is difficult to understand by parents though. I thought maybe you could start saying that bitcoin is the same as other currencies, that's not a problem