It's a road trip to remember when Sunny and her family set out for a family reunion they'll never forget. Sunny is excited for her family's road trip this year. They'll be living in a camper (always fun), going to some historical places (sometimes fun), and taking along an unexpected pet (more fun for some family members than others). The only person who isn't excited is Gramps, because there is a family reunion at the end of the trip and he hasn't talked to his brother, Sunny's great uncle, in many, many years. Sunny can't wait to meet her first cousins and second cousins and possibly even third cousins -- but will they be able to have a good time if Gramps and his brother are still fighting?