First, there are a growing number of books, perfect for encouraging your family to explore their path together.
|The Simple Sabbat
I guess I'm bias on this one because I am a HUGE fan of Flora Peterson. But it really is a wonderful book. It's easy to read, short and to the point, with crafts, rituals and activities for each Sabbat.
This list is only a small portion of what I have found out there and does not include the many books full of mythology and/or stories meant to inspire. I have been building a Listmania List for Pagan Children's books. If you're looking for more titles, make sure to check it out!