When Joan's creative writing teacher, Professor Sinclair Wilde, praises her work, John assumes it is because he has a crush on her. Also, Tyler and Clementine invite Matt and Colleen over for an awkward dinner party; Jen tries to hide it from Greg when Lark takes her first steps while he's away on a business trip; and Colleen, Heather and Jen take Dougie out for ladies night when she realizes she might be gay.

Heather freaks out when Samantha auditions for the high school musical and the director doesn't give her the part. Also, Matt, Greg and Heather suspect Joan is having an affair, and Tyler and Clementine decide to find a home of their own.

When Colleen goes to Tim for help with an embarrassing ailment, she begs him not to tell the family. Also, Dougie enlists Joan to help her buy a gift for Matt and Colleen's wedding. Heather gets jealous when her friends want to include Jen in their group.

When Greg and Jen take Lark on her first airplane trip, their parental skills are upstaged by another couple travelling with their baby. Also, Joan and John attempt to smuggle their dog, Tank, onto the plane; Matt and Colleen miss their flights when they accept travel vouchers for airline credits; and Heather and Tim run into countless obstacles when trying to get to the airport on time.