Before their parents got married to one another, 15-year-old Derek and 14-year-old Casey ruled their respective houses as the oldest sibling. Now they're in constant rivalry for top dog status of the five kids all living under one roof. The two teens will plot anything they can think of at school, with friends or other siblings to win these funny family battles.
When Derek already has a girlfriend, Casey is shocked when he asks out a friend of hers, Lucy. Casey asks Emily to dig up information on whether Max is available or not. Meanwhile, Nora has set up a dinner with another family, but some members of her family object.
Derek lands a leading role in a school musical, and Casey gives him acting advice.
Derek swaps test papers with Casey and then devises a plan to keep from getting caught.
Derek's mom tries to get him to live with her in Spain for six months.
Derek breaks up with Kendra to get out of buying her a Valentine's Day gift, so she asks Max to the school dance.
Max gives Casey his football jacket, which apparently causes her to develop allergies.
Derek gives Edwin dating tips, but they don't seem to work for him.
Michael Seater
Derek Venturi
Ashley Leggat
Casey MacDonald
Jordan Todosey
Lizzie MacDonald
Ariel Waller
Marti Venturi
Joy Tanner
Nora McDonald Venturi
John Ralston
George Venturi
Daniel Magder
Edwin Venturi
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