This is one you can read with the kids. Peter Schiff gives us one of the most easy to understand and complete explanations of our economy ever written. His island and fish analogy may be a bit unconventional but it makes a great economics primer.
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Also highly recommended by Corsair's:
Easy Economics : A Visual Guide to What You Need to Know
Easy Economics is easy and visual. It is a great primer read for those trying to get started understanding the often confusing landscape of economics, a field that can often be confusing and daunting for those without a strong understanding of its many facets. This book is the place to begin.