I'm going to have to disagree with most of the other reviewers here. I tried using this book and audio CD to teach my seven-year-old German, which I already speak, but it's just not working for us.
There are four main problems with this book and audio CD:
1. The German speakers are too hard to understand. They speak very quickly. I can understand them just fine, but my daughter can't, even when she knows the words. This is especially true with the children who speak on the CD. Sometimes these children change their voice to sound like animals and other people, and that makes it even more difficult.
2. The audio CD does not match the book. Even within the the first ten pages of the book, the audio CD sometimes just ignores a page or part of a page. We'd be listening to a lesson and following it in the book, and then the next lesson would skip the rest of the page and jump to the next page.
3. The CD is divided into tracks, but the lessons are not one-to-one with the tracks. That is, you might need to rewind within a track to get to the beginning of a lesson, instead of just starting the track again. I imported the CD into iTunes to make it easier to go backwards and forwards, and I still got confused several times.
4. I found that the general order in which things are covered doesn't make much sense. The book will introduce full sentences and expressions, but not cover the basics. So you will learn to say, "My name is" and "Your name is", but not "His name is" or "Their name is". There's no real coverage of German grammar.
So if you already speak German, and you want to teach your children, don't get this book. Your better off getting a regular book that teaches German vocabulary and grammar the old-fashioned way. You already speak the language, so your children won't need to hear it from someone else.