Jennifer's life couldn't be more different from that of her sister, who is married with three kids. Jenny's committed to her job and being a good aunt, but little else. This all changes when her sister takes off to Europe with her husband, leaving her alone with the kids.

As well as guidebooks, Jenny brings her sister Mandy a gift to encourage her to have more fun on her Paris holiday. As Jenny leaves for a date with boyfriend, Quinn, she bumps into Will, Mandy’s new neighbor.

Mandy says goodbye to her kids before she and her husband leave on their long-awaited honeymoon. But suddenly, her parents are unable to provide childcare, and it's too late to hire a babysitter. Can Aunt Jennifer be trusted to fill in?

After her sister reluctantly leaves her in charge, Jennifer is shocked by the complex plans and arrangements made for the kids. She drops into work to explain that she needs to take some time off, and promises to make up the time.

Jennifer drops her niece off at soccer practice and notices that she’s being bullied by other girls. When bringing the kids home, she meets Will again and has another nice chat with him. That evening, Jennifer’s cooking talents come under scrutiny when she prepares her first dinner for the kids.

Even though her sister still doesn't trust her, Jennifer's got thing more or less under control. The next day, she has all the children’s lunches ready in time for school, gives Flo an early birthday present, and makes a deal with Alice, who’s pushing the boundaries with her mom away.

Mandy’s husband isn’t as determined as she is to enjoy the cultural highlights of their European holiday, and tries to get her to relax. Back home, crisis strikes as Jennifer does the laundry. Will shows up to save the day, and Jennifer finds out more about his previous life over lunch.

While Jennifer cooks dinner, the kids receive a Skype call from their mom, who still hasn't relaxed into her vacation. Jennifer and Mandy’s mom calls Jennifer and gives her an update on their dad’s health, but all is not as it seems! The next day, Will takes his chance to ask Jennifer out on a date.