1 Nephi 5:16

And thus my father Lehi did discover the genealogy of his fathers. And Laban also was a descendant of Joseph, wherefore he and his fathers had kept the records.

This is how my father Lehi learned about his family history. Laban also came from Joseph’s family. That’s why he and his fathers had kept the records.

That’s how my father discovered his family history. Laban was also descended from Joseph—that’s why his family had kept these records.