[2] The song was written by Bear and Bo Rinehart, and produced by Dave Tozer, using elements of Ed Cash's LP version.

[4][5] Entertainment Weekly's Madison Vain stated "[Brother] is full, anthemic, a little bit woodsy, and alarmingly catchy."

and claimed that "[Bear Rinehart's] sincerity is unmistakable in his vocals, and the bluegrass backing culminates in something sweetly rich.

[7] BreatheCast's Jeannie Law said it was an "unforgettable collaboration" and that "[Bear Rinehart's] raw vocals, and the bluegrass backing truly make the song a powerful anthem.

"[8] Jeff Koch of PopMatters called it "cheesy" and said that "[Brother] is practically begging to be used in the background of some Grey's Anatomy montage.