Twenty-five-year-old Jennifer Mills lives her life without commitment, relieved her boyfriend isn’t even close to putting a ring on her finger. Not at all like her older sister, Mandy, who married young and settled into family life, Jennifer loves being carefree. When Mandy and her husband plan a three-week European vacation without their three kids, Kathryn, her mother, convinces Jennifer to help watch them until she can get into town. Jennifer quickly finds out playing house isn’t for kids. But, with a little help from the handsome new neighbor across the street, Will, Jennifer manages to pull it together to prove to everyone, and even herself, that taking responsibility can be rewarding.