A uthor AJ Jacobs has taken on a quest to unite the entire human race in one all-encompassing family tree. His book is It's All Relative: Adventures Up and Down the World's Family Tree . In his adventures, he finds that indeed he is a cousin of George H.W. and Barbara Bush, Ricky Gervais, John Legend, and Steven Pinker — which just goes to show you that we are all cousins. Listen in on the conversation to hear how he makes the connections. And it’s not just 23 and Me or Ancestry.com.