As I promised Endrene, I am recommending a book which I am sure will appeal to her boys as it has a much lower lexical density. It is undemanding and it will get the uninitiated quickly interested in Warren Buffett and his approach to investing.
I got my copy of the book almost 10 years ago when it was first published and, honestly, it was my first Warren Buffett book. So, if you had thought of AK71 as a scholarly person, banish that thought!
Buy the book here and help support literacy programs for the poor and underprivileged:

Warren Buffett: An Illustrated Biography of the World's Most Successful Investor
Price: US$ 18.45. Free shipping worldwide.
For people who prefer ebooks, it costs US$ 15.40.
See it here: Warren Buffett
For people who do not particularly enjoy reading, this book will do the trick. Confirm and double confirm!
Related post:
The Little Book That Beats The Market.