Anna has two rules for the annual Pace family destination vacations: Tread lightly and survive. It isn't easy when she's the only one in the family who doesn't quite fit in. Her twin brother, Benny, goes with the flow so much he's practically dissolved, and her older sister, Nicole, is so used to everyone—including her blandly docile husband and two kids—falling in line that Anna often ends up in trouble for simply asking a question. Mom...