A surprise engagement leads four soon-to-be step-siblings on a 1,400 mile road trip to set aside their differences and become a blended family.

吉尔伯茨对鸡蛋过敏，导致欺凌和尴尬。他试图保守过敏症的秘密，但当他可怕的姑姑要照顾他时，她试图用鸡蛋毒害他。但吉尔伯特计划复仇。