Grey's Anatomy

Kate is in uncharted territory and finds support from her best friend Meg (Natalie Morales) a party-hearty singleton and the only woman Kate knows who has less experience with kids than she has.

When Kate asks for more responsibility, Pete has her help him coach Bert's soccer team; Warren and Hillary stain Diane's couch.

When Hillary lies to hang out with a boy, Diane and Pete snoop to learn more about the guy; Albert gets too involved in Jackie's career.

Meg creates conflict when she stays with Kate and Pete after a break-up.

Pete and Kate try to carve out some alone time at Diane's school fundraiser; the kids help Jackie with her online dating profile.

The costume Jackie made for Bert doesn't work out.

Jackie crashes Pete and Kate's party and hooks up with one of Pete's co-workers (Nat Faxon); Diane and Meg have a confrontation.

Diane tries to take charge when Harrison household is infected with lice, but Kate feels bulldozed; Bert and Warren fight over a teddy bear.

During a field trip, Kate tries to set Diane up with another parent; Bert tries to get on his teacher's good side.

Kate, Pete, Jackie and Diane try to piece together the events of Christmas Eve when they wake up, hung over, with the house in a disastrous state.

Kate tries to give Pete a fun birthday; Diane and Jackie shop for a gift for Pete; the lobsters resist becoming dinner.

Kate asks Diane for help disciplining Warren and Hillary; Jackie and Pete try to set a good example during an outing with Bert.

When Bert loses a tooth and Pete misplaces it, his solution causes big problems with Jackie. Meanwhile, Kate channels her maternal nature and advises Warren during his first study date, and Diane helps Hillary host her first high school sleepover.

Kate and Jackie butt heads when they try to work together on Jackie's latest business venture; Pete takes Warren and Bert to karate lessons.

After Bert successfully reads 100 books, Kate and Pete throw him his dream birthday party; Warren befriends the guy Hillary has a crush on.

Pete agrees to let Kate plan a "do over" wedding when she has regrets about their elopement; Diane makes a decision about her relationship; Jackie struggles to tell Bert that she and Sad Steve are dating.

Kate tries to ignore the stress and chaos around her--which increases with the arrival of her mother and Pete's parents. As wedding planning continues, the family receives bad news.

Pete lies and tells Diane that he and Kate are in couples counseling.

Kate struggles when she takes over the PTA and ends up being faced with blackmail; a boy's parents forbid him from going to a school dance with Hillary.

Concerned about Warren's social life, Kate encourages him to make friends.

Kate agrees to accompany Jackie to her high school reunion.

On the season finale, Kate seeks revenge on Diane and Jackie.