While Pete is swamped at work, Kate plots revenge on his ex-wives when she discovers the real reason for letting her have the kids on Mother's Day.
When Kate agrees to join Jackie at her high school reunion, she doesn't realise what it will entail. Meanwhile, Bert is left with Meg and Tevin as Pete and Diane take Warren and Hillary on a college visit.
Kate's plan to expand Warren's social life by encouraging him to involve himself with clubs or sports backfires and Pete tries to teach Bert the value of money. Meanwhile, Hillary seeks some creative inspiration with her art assignment from Jackie.
Kate struggles with the PTA and asks Diane for help when she is blackmailed. Back at home, Warren wants Vanessa Hudgens to accompany him to the school dance, while Hillary is forbidden to go with her choice.
Kate's wedding stress is increased when her mother and Pete's parents arrive.
Kate discovers videos of Pete's previous weddings and feels bad that eloping meant that she didn't one, so decides to plan a new one. Meanwhile, Jackie attempts to break the news to Bert that she's seeing Sad Steve and Diane's relationship with Russ Bradley Morrison is revealed publicly.
When Bert finishes reading his one hundredth book, Pete and Kate have to throw him his ideal birthday party, consisting of fire eaters, dancers and a special visitor. Upset that soccer moms are shunning her at the matches, Kate uses the party as an excuse to befriend them. Meanwhile, Diane and Pete argue over her driving and Warren becomes best mates with Hillary's would-be boyfriend.moreless
Things get messy when Kate joins Jackie in her new school catering business, while Pete signs up Bert and Warren for karate lessons.
Jackie is none too pleased with Pete when he loses Bert's tooth. Meanwhile Diane gives Hillary advice on hosting her first high school sleepover and Kate helps Warren during his first study date.
Kate asks for Diane's advice on disciplining Warren and Hillary, while Pete and Jackie take Bert out for the day.
When Pete tells Kate that he suffers from a birthday curse, she sets out to break it and ensure he has fun this year. Meanwhile, the children do battle with lobsters and Jackie goes shopping for birthday presents with Diane.
When they wake up on Christmas morning with a hangover and see what a state the house is in, Pete and his three past and present wives try to work out what happened.
As Pete is nursed back to health by Jackie, Kate attempts to play cupid with Diane and another parent. Meanwhile, Bert tries to get his teacher to like him.
The Harrison household has lice and Diane takes charge. However, annoyed at being excluded, Kate teams up with Jackie to try to prove a point to Diane, but only succeed in making things worse. Meanwhile, Bert and Warren fight over a teddy bear.
Jackie turns up at Pete and Kate's party and hooks up with Sad Steve, Pete's colleague. Despite finding it uncomfortable to start with, both try to help them make a go of it, when things look likely to develop. Meanwhile, Meg upsets Diane after posting an unflattering picture of her on Instagram and Hillary helps her brothers put together a live stream.moreless
Kate takes over Halloween while Pete makes a teenager his captive.
Kate and Pete are finding hard to get any time to themselves, so decide to sneak away to a janitor's closet during Diane’s 80s-themed school fundraiser. Meanwhile, Jackie gets help from the kids on her online dating profile.
Meg temporarily staying with Pete and Kate causes tension between the two women and leads to Kate having to choose between being a wife and a step-mother. Meanwhile, Warren gets inspiration for his future during a Lego project.
After Hillary is caught lying so she can meet up with a boy, Pete and Diane decide to snoop on her Facebook page to find out more about him.
Pete asks Kate to assist him in coaching Bert's soccer team when she says she would like more responsibility. Meanwhile, Hillary and Warren leave a stain on Diane's couch.
Kate volunteers to run a PTA meeting in order to prove herself to her husband's ex-wives and her three step-children. Unfortunately, she finds herself in a compromising position following an encounter with vodka.