These are the sons of Seir In the midst of the genealogy of the Edomites is inserted the genealogy of the Horites, that were the natives of mount Seir before the Edomites took possession of it, Deuteronomy 2:12; Deuteronomy 2:22. This comes in here, not only to give light to the story, but to be a standing reflection upon the Edomites for intermarrying with them, by which it is likely they learned their ways, and corrupted themselves.
Related Commentaries of Genesis 36:20
Genesis 36:20
20 These are the sons of Seir the Horite, who inhabited the land; Lotan, and Shobal, and Zibeon, and Anah,