Huntsville Police arrested 62-year-old Johnny Allen Hereford on an assualt charge.
Around 11:06 p.m., investigators said an altercation broke out between two brothers in the 4200 block of Keith Street.
Police said Hereford pulled a gun in the middle of the argument and shot his brother, who hasn't been identified.
The victim was taken to Huntsville Hospital with non-life threatening injuries. Hereford was taken into custody at the scene.
Part of Keith Street was taped off while police investigated the shooting.
A motive is unknown right now.