Duke Jeusn... — Aholibamah’s three sons are dukes, but only the grandsons of the other wives. The reason of this probably is that she belonged to the dominant family of Seir, and her sons took the command of districts and tribes of the Horite people in her right.
Related Commentaries of Genesis 36:18
Genesis 36:18
18 And these are the sons of Aholibamah Esau's wife; duke Jeush, duke Jaalam, duke Korah: these were the dukes that came of Aholibamah the daughter of Anah, Esau's wife.