Don't get me wrong, it's a nice little story, and one of the positives about this book is that it can be a nice introduction to mulitplication. And I also think parents can use this as a springboard to discuss their own family tree with a child, so that's lovely too. But the prose doesn't have that musical, lyrical quality that so draws my daughter to Goodnight Moon. And the illustrations get a little strange in the last few pages.
Overall, this is a nice book for occasional reading, but won't be a bedtime classic any time soon.