18
Those were the children and grandchildren who were born to Jacob and Zilpah. Laban had given Zilpah to his daughter Leah. The total number of people in the family line of Jacob and Zilpah was 16.
18
These were the sons of Zilpah, whom Laban gave to Leah, his daughter (whom Laban gave to his daughter Leah), and (through whom) Jacob begat these sixteen persons.