Anthony McPartlin and Declan Donnelly may think they know who they are, but in this two-part documentary, the popular presenters uncover their surprising and emotional family histories, using a combination of DNA and genealogy. The shock revelations include military men in both of their families - one a medal-winning war hero, the other a deserter. And as well as delving into the past, Ant and Dec also get to meet DNA relatives they never knew existed.