Daiana Campeanu as Sondra
Sonda is Leslie and Frank’s third child. She’s credited as being one of the nicer cousins to Kevin, though she does get mad during his fight with Buzz that ruined their pizza dinner. Glaring at Kevin the entire time she’s wiping away spilled milk, she retires to bed not long after but wakes up late the following morning.
Like her cousins, Sondra becomes visibly upset by the fact that they just ditched Kevin. We see her enjoying a platter of shrimp appetizers while sitting on her family’s couch and watching It’s a Wonderful Life in French. Sonda would make an appearance in the sequel in New York, too.