Experience everything you love about family history in 43 fascinating minutes on the season premiere of Who Do You Think You Are? One-hundred-and-fifty years after the start of the Civil War, Grammy-winner Kelly Clarkson discovers her great-great-great-grandfather enlisted with the Union — twice. And she sets out to learn if her own strength and commitment to causes was passed down from him. Kelly’s journey takes her to battlefields, prisons and beyond as she finds out more about her deep roots in American history. Watch Tuesdays 9|8c on TLC.