I second the recommendation to check at your local library before you purchase any book for a couple of reasons. Different guides have different focuses and different opinions, so you'll need to see which one matches you and your family the best. It would be a waste to buy a book and then find out you disagree with half of their recommendations/opinions (if you always agree or always disagree, that would be helpful, but fifty/fifty is not). Also, things change relatively quickly with DLR, so by the time a guide is published, there is a good chance that some of the information will be out of date.