Teaching your child about Cryptocurrency is a very good idea, but you might also want to know if he/she wants or has the interest in this very complicated environement. Yes, teaching your child in an early age may give him/her a financial awareness but at some point you are taking away the joyfulness of being a child. In crypto world we must have patience and discipline. Try to teach him the very basics slowly but surely without any pressure.
Goodluch mate.