Shelby Blackstock is remembering his late brother Brandon Blackstock. Shelby, the son of Reba McEntire and her ex-husband Narvel Blackstock, shared an emotional tribute post to Instagram on Friday, Aug.

The family of Kelly Clarkson’s ex-husband, Brandon Blackstock, is beginning to speak out after his tragic death at age 48. Brandon died on Thursday, August 7, after a private, yearslong battle with cancer. His brother, race car driver Shelby Blackstock, 35, was one of the first in the family to publicly address his passing.

In the wake of Brandon Blackstock's death, Reba McEntire—who was married to the music manager's dad Narvel Blackstock from 1989 to 2015—honored her former stepson.

Sources tell PEOPLE that Blackstock, who was previously married to Kelly Clarkson, moved to Montana three years ago, when he was diagnosed, and bought the home in Butte where he died. In a statement announcing his death, a rep for the family echoed Hollis's statement, and also noted that Blackstock was "surrounded by family" when he died.