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.