Reba McEntire's son, Shelby Blackstock, is paying tribute to his half brother Brandon Blackstock. "Words cannot begin to capture the tremendous loss our family has endured. Yesterday, we lost a brother, a father, a grandfather and a son," Shelby, 35, wrote via Instagram on Friday, August 8. "Brandon Blackstock was an irreplaceable part of our family - funny, bright and full of life - and he will be deeply missed." In a collage of photos, Shelby shared happy memories with his half brother, including moments from various family vacations.