His concubine, whose name was Reumah, also bore Tebah, Gaham, Tahash, and Maacah.

And Abraham gave gifts to the sons of his concubines, but while he was still alive he sent them eastward, away from his son Isaac, to the land of the East.

While Israel was living in that region, Reuben went in and slept with his father’s concubine Bilhah, and Israel heard about it.

Jacob had 12 sons:

Timna, a concubine of Esau’s son Eliphaz,
bore Amalek to Eliphaz.
These were the sons of Esau’s wife Adah.