There is no such thing as an ordinary family. Each one has its own stories: the black sheep, the Civil War hero, the ancestors who fled to the United States, or the lost family fortune. No matter how plain you think your background is, chances are there is a saga just waiting to be discovered. The ground-breaking NBC series Who Do You Think You Are? takes seven of America's best-loved celebrities-from Lisa Kudrow to Susan Sarandon-on an emotional...