Laban also gave Zilpah his maid to his daughter Leah as a maid.

When Leah saw that she had stopped bearing [children], she took Zilpah her maid and gave her to Jacob as a [secondary] wife.

Zilpah, Leah’s maid, gave birth to a son for Jacob.

Zilpah, Leah’s maid, gave birth to a second son for Jacob.

and the sons of Zilpah, Leah’s maid: Gad and Asher. These are the sons of Jacob born to him in Paddan-aram.

These are the generations of Jacob.

Joseph, when he was seventeen years old, was shepherding the flock with his brothers [Dan, Naphtali, Gad, and Asher]; the boy was with the sons of Bilhah and Zilpah, his father’s [secondary] wives; and Joseph brought back a bad report about them to their father.

These are the sons of Zilpah, [the maid] whom Laban gave to Leah his daughter [when she married Jacob]; and she bore to Jacob these sixteen persons [two sons and fourteen grandchildren].