well kids like to play, so something that can bring together bitcoin and gaming
like puzzle that when solved reveal a private key for example
it is important that kids start to learn early some basic economy, at least something about income and expenditure
i heard about a new law for some countries that will make it possible(to teach them basic economy) in schools
Tell them to watch videos on youtube and then show them how to deal with it
by simply learning through experience but if it is not their interest so it's hard to teach them so i think i need to wait for the right time when they are mature enough and can fully understand what is bitcoin and what is the advantage of doing bitcoin.