Genesis 36:13
And these are the sons of Reuel; Nahath, and Zerah, Shammah, and Mizzah: these were the sons of Bashemath Esau’s wife. And these are the sons of Reuel; Nahath, and Zerah, Shammah, and Mizzah: these were the sons of Bashemath Esau’s wife.
Genesis 36 is wholly taken up with Esau and the nations which sprang from him, and this listing of Reuel's sons belongs to that account. It stands in the time after the death of Isaac at the age of 180. At that time Esau and Jacob probably met for the last time, when Jacob was about 109, Joseph was 17, and Benjamin was a small child from two to four years old.