He was a descendant of

1. 1 Ne. 5: 14
     14 And it came to pass that my father, Lehi, also found upon the plates of brass a genealogy of his fathers; wherefore he knew that he was a descendant of Joseph; yea, even that Joseph who was the son of Jacob, who was sold into Egypt, and who was preserved by the hand of the Lord, that he might preserve his father, Jacob, and all his household from perishing with famine.
2. Alma 17: 21
     21 And thus Ammon was carried before the king who was over the land of Ishmael; and his name was Lamoni; and he was a descendant of Ishmael.
3. Hel. 1: 15
     15 And they came down again that they might pitch battle against the Nephites. And they were led by a man whose name was Coriantumr; and he was a descendant of Zarahemla; and he was a dissenter from among the Nephites; and he was a large and a mighty man.
4. Ether 1: 6
     6 And on this wise do I give the account. He that wrote this record was Ether, and he was a descendant of Coriantor.
5. Ether 11: 17
     17 And it came to pass that there arose another mighty man; and he was a descendant of the brother of Jared.
6. D&C 96: 7
     7 For he is a descendant of Joseph and a partaker of the blessings of the promise made unto his fathers—
7. D&C 107: 69-70
     69 Nevertheless a bishop must be chosen from the High Priesthood, unless he is a literal descendant of Aaron;
     70 For unless he is a literal descendant of Aaron he cannot hold the keys of that priesthood.