Genesis 22:24

22:24 His concubine, whose name was Reumah, also bore him children – Tebah, Gaham, Tahash, and Maacah.

Genesis 25:6

25:6 But while he was still alive, Abraham gave gifts to the sons of his concubines and sent them off to the east, away from his son Isaac.

Genesis 36:12

36:12 Timna, a concubine of Esau’s son Eliphaz, bore Amalek to Eliphaz. These were the sons of Esau’s wife Adah.

Genesis 35:22

35:22 While Israel was living in that land, Reuben had sexual relations with Bilhah, his father’s concubine, and Israel heard about it.

Jacob had twelve sons: