It's a spring break morning, and by 11 a.m. at the Anderson home, chaos is erupting. School is out for the week, and the twin boys are throwing a ball inside the spacious, two-story house. Upstairs, the preteen daughter pretends not to hear her mother calling. Lauren Anderson, a tanned and well-dressed stay-at-home mom who seems incapable of sitting still, cajoles her offspring to behave as she waits for a babysitter to arrive. Her youngest, Nicole, five, is frowning. Nicole's face is framed with delicate brown braids, and her fingernails are painted a rainbow of colors. She plans to go...