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
In addition to investing, you can teach your child the concept of a financial budget and the importance of a financial breakdown. Start by distinguishing which is the need and which is the desire. Start with an example that exists in their environment.