These are the sons of Reuel: Nahath, Zerah, Shammah, and Mizzah. They are the grandsons of Esau’s wife Basemath.
Jewish Publication Society of America Version (JPS1917) - Genesis 36:13 >And these are the sons of Reuel: Nahath, and Zerah, Shammah, and Mizzah. These were the sons of Basemath Esau's wife.