Watch : Kelly Clarkson Shares Rare Update on Kids After Ex Brandon Blackstock’s DeathBrandon Blackstock's brother is honoring him one year after his death. Shelby Blackstock penned a touching tribute to the talent manager—who shared daughter River, 12, and son Remy, 10, with ex-wife Kelly Clarkson—on the first anniversary of his death following a private battle with cancer. "It’s been one year since we lost you… a void that can never be filled," Shelby wrote on Instagram Aug. 7. "A lot has happened this past year," the 36-year-old, whose wife Marissa Blackstock is pregnant with their first baby, continued. Shelby—the son of Reba McEntire and Narvel Blackstock—went on to reflect on their childhood together, and the strong sibling bond they shared.