Tim McGraw is set to trace his roots and appear on the new season of the NBC show Who Do You Think You Are? The second season of the NBC show is will return to tv in January and will again follow celebrities while they are followed by cameras as they search the globe exploringg thheir family trees and trying to dig up their long-lost family history. Of course, the celebrities have the help of historians and genealogists along the way. Other celebrities set to appear this season are Steve Buscemi, Ashley Judd, Vanessa Williams, Rosie O’Donnell, and Kim Cattrall. The season premier is scheduled for January 21 at 7pm Central on NBC.