If anyone hasn't read Peter Schiff's 'How and Economy Grows and Why it Crashes', I highly recommend the book for adults and children alike.

Banks and governments pretend that economics is much more mysterious than it is, in order to cover up their money-printing. But this really distils it to its essence, and explains why inflation always creates misery.

Various free copies of the pdf online, but I recommend buying the coffee-table cartoon version for your kids; never to early to orange-pill them!