Kenny Centazzo is the author of the book "Tower of Druids". In Cabin Fever, Greg explains that he got the book signed by the author last year, which was Kenny Centazzo. In the present, Greg figured out that a first-edition signed copy "Tower of Druids" is worth 40 dollars, enough to make Gregory's Little Friend in Net Kritterz a jacuzzi. So Greg wants to sell it, but Susan said she waited a long time to get that book signed by the author, so he might regret it. Plus, Susan said that when he has kids, they would be mad because that Greg sold it. So now, Greg is clearly turned off to having kids as mentioned by him, rather spending his money on vacations and luxuries like Uncle Charlie.