The fourth book in the Adventures with Pop Pop series picks up with a longstanding family tradition of visits to Grant's Farm that started back in the 1960s when Na Na's mom drove a school bus, and she would take the kids on tours of Grant's Farm. This tradition continued with Pop Pop and Na Na's own children and in recent years continues with their grandchildren, whom Pop Pop has dubbed as his Grandmen: Grandman Dean and Grandman Levi.