Erin & Aaron

Erin and Aaron's first day as step siblings and they are in no mood to get along. But when they discover that their differences may lead to a family break-up, they must find a way to come together.

Aaron finds the perfect replacement for his beloved broken piano but the shop owner, Mr. Ledder, has a history with Erin and refuses to sell the piano to an instrument killer like her.

Aaron sets out to find a girlfriend to break his heart so he can write a hit song, that girlfriend turns out to be Erin's BFF, Vivian; Erin tries tricking Vivian into breaking up with Aaron but ends up betraying her trust.

Erin and Aaron clash over Saturday night traditions: Erin wants pizza and Aaron wants sushi; Chuck and Natasha have a special daddy-daughter day planned but struggle to find a shared activity they'll both enjoy.

While Chuck and Sylvia take a vacation, Erin and Aaron convince their parents to let them babysit Natasha, not realizing how much trouble she will be.

Erin and Aaron are excited to compete in the music competition between band and chorus with the winning team getting a trip to New York City; Erin's laid-back ways causes Aaron to kick her out of band, driving her to battle it out by joining chorus.