Name all of Jacob Blacks family members?

Answer 1

Ephraim Black is Jacob Black's Great-Grandfather (Diseased)

Billy Black is Jacob Black's Father

Sarah Black is Jacob Black's mother (Died in a car accident)

Rachel and Rebecca Black (Twins) are Jacob Black's sisters

And it is speculated that Embry Call could be Jacob Black's brother though it is never proved, Also we don't know who Billy Black's father is because he is never mentioned in the books.

Answer 2

Jacob Black's family members include his father, Billy Black, and his sisters Rachel and Rebecca. In addition, he is part of the Quileute tribe and considers other tribe members, such as Sam Uley and the rest of the werewolf pack, as family as well.

Answer 3

Rebecca and Rachel; Rebecca is married and in Hawai'i, and Rachel is imprinted on by Paul, another member of the shape-shifter pack.