The Book of Mormon is sometimes referred to as the “stick of Joseph” (Ezekiel 37:19) or the “stick of Ephraim” (D&C 27:5). Lehi was a descendant of Manasseh (see Alma 10:3) and Ishmael was a descendant of Ephraim. The prophecies of Jacob (see Genesis 48:16; 49:22) were fulfilled as Ishmael’s family (Ephraim) came to the American continent with Lehi (Manasseh).
Elder Erastus Snow (1818–88) of the Quorum of the Twelve Apostles discussed the importance of Ishmael’s lineage: “Whoever has read the Book of Mormon carefully will have learned that the remnants of the house of Joseph dwelt upon the American continent; and that Lehi learned by searching the records of his fathers that were written upon the plates of brass, that he was of the lineage of Manasseh. The Prophet Joseph informed us that the record of Lehi was contained on the 116 pages that were first translated and subsequently stolen, and of which an abridgment is given us in the first Book of Nephi, which is the record of Nephi individually, he himself being of the lineage of Manasseh; but that Ishmael was of the lineage of Ephraim, and that his sons married into Lehi’s family, and Lehi’s sons married Ishmael’s daughters, thus fulfilling the words of Jacob upon Ephraim and Manasseh in the 48th chapter of Genesis, which says: ‘And let my name be named on them, and the name of my fathers Abraham and Isaac; and let them grow into a multitude in the midst of the land.’ Thus these descendants of Manasseh and Ephraim grew together upon this American continent” (in Daniel H. Ludlow, A Companion to Your Study of the Book of Mormon [1976], 199).
Refer to the chart “The Stick of Judah and the Stick of Joseph” in the appendix (page 412).