Rich Dad Poor Dad is actually pretty relevant, I know a lot of people like to shit on this book because it's very basic and some of the lessons are out of date but the whole thing is written from the standpoint of the guys "rich dad's" advice and his "poor dad's" advice.

There's a great story about when he and his friend (rich dad's son), try to "create" money. They go around collecting their neighbourhoods used toothpaste tubes (which in those days were made of lead  ) and melt them down into nickels. When their dads discover the operation they get a lesson in counterfeiting but rich dad is proud of their out of the box thinking.

Anyway the first few chapters might be of some use, they start a comic book library and other silly antics as kids which might inspire your children!