Kelly Clarkson is worried for her kids following the death of her ex-husband. It's something especially painful for her... given her own childhood. The American Idol alum has been really candid about having grown up with an estranged relationship to her father, Stephen Michael Clarkson. She's opened up about it many times over the years, and of course her hit song Piece By Piece tells the story of not only her relationship with her dad, but with her late ex Brandon Blackstock, too.