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.

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.

An obituary for the late talent manager revealed that Blackstock was “building a life” with Clarkson’s former assistant, Brittney Marie Jones, as he lost his battle with cancer.

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.