Rusty Griswold (Ed helm) is now an grownup work as a airplane pilot for a low budget air hose name Econo-Air, and he share a stale human relationship with his married woman Debbie (Christina Applegate) and their two son, the shy and awkward aged son James IV (Skyler Gisondo), and the sadistic and daunting jr. son Kevin (Sir Richrd Steele Stebbins).