There are several reasons for this:
* The focus of the book is on the abuse Dave endured, not his family life. The book is a testament to his resilience and survival, not a celebration of his family.
* Dave's relationship with his family was extremely fractured and abusive. It's likely that he wouldn't have wanted to include pictures that would remind him of the pain he suffered.
* Privacy concerns might have prevented the use of family pictures. Even though Dave shared his story with the world, he may have wanted to protect the privacy of his family members, some of whom were involved in the abuse.
If you're interested in learning more about Dave Pelzer and his story, there are resources available online, including his website and interviews he has given. However, you won't find any family pictures publicly available.