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Reba McEntire is remembering her "cowboy" former stepson Brandon Blackstock a week after his death following a years-long battle with melanoma.

The country singer mourned Brandon in an Instagram tribute Tuesday night ... sharing throwback photos together while reflecting on his impact during his time on Earth.

She writes ... "There is no one else like him, and I’m thankful for the time we had together. His legacy and laughter will be carried on through his family. Rest in peace cowboy. Happy trails to you til we meet again."

Reba originally broke her silence on Brandon's death by commenting on an emotional Instagram tribute from her son, Shelby Blackstock , whom she shares with ex Narvel Blackstock . Gallery Launch Gallery

She wrote ... "Very well said Shelb

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