Sondra McCallister is Kevin's cousin, Sondra is the sister of Tracy, Brooke, Rod, and Fuller McCallister, and daughter of Leslie and Frank McCallister. Sondra is one of the very nicer characters and doesn't have that many lines.
Sondra is first seen getting ready to go on the families trip to Paris, France. Sondra is next seen eating pizza and gets mad with the rest of the McCallister family when Kevin gets into a fight with Buzz over cheese pizza. The next morning as the family sleeps in because of a power serge Sondra is seen rushing to the airport with her family to catch the flight that they taught they were going to miss but made it on time. She then realizes that Kevin is missing and is worried about him not making the flight. Sondra is also seen in her Uncle Rob's apartment watching a movie it's a wonderful life when her father Frank McCallister brings in an appetizer of shrimp.