Daiana Campeanu as Sondra
Sondra is the third child of Leslie and Frank. She's often regarded as one of Kevin's more pleasant cousins, although she did become irritated during his spat with Buzz, which disrupted their pizza dinner. While wiping away spilled milk, she shot Kevin an annoyed glare, then retired to bed shortly after. The following morning, she woke up late.
Like her cousins, Sondra was visibly upset about the family leaving Kevin behind. We glimpse her indulging in a platter of shrimp appetizers while lounging on her family's couch, watching "It's a Wonderful Life" in French. Sondra also made an appearance in the sequel set in New York.
