The Tusken Raider who was the male sibling of A'Vor belonged to the tribe led by A'Yark.
This twin of A'Vor resided on the planet Tatooine, situated in the Outer Rim, during the era of the Galactic Civil War, as a member of the tribe under the leadership of Chieftain A'Yark. Not long before the Battle of Yavin, he, his twin brother A'Vor, and their cousin A'Koba killed a young krayt dragon as part of a ritual marking their transition into adulthood. Following this, they asserted to A'Yark their capability to eliminate adult krayt dragons too.
Following A'Koba's act of rendering Luke Skywalker unconscious, he, his twin, and their cousin initiated a search of Skywalker's landspeeder. Their search was interrupted when Jedi Master Obi-Wan Kenobi frightened them off, as he imitated the sound of a krayt dragon, causing A'Vor and the other Tusken Raiders to scatter and flee.