WHICH GROUP IS LEHI'S AND ISHMAEL'S FAMILY DESCENDED FROM?

Gen. 49:22 says Joseph is a fruitful bough, (that is: will have a large posterity) even a fruitful bough by a well; whose branches run over the wall: (that is: Joseph's posterity will come over the ocean; this prophesy was fulfilled, at least in part, by the coming of Lehi and his people to America). 3 Nephi 15:12 says:

12. Ye are my disciples; and ye are a light unto this people, who are a remnant of the house of Joseph. (The O.T. Made Easier, pg. 425, Dr. David J. Ridges)

Joseph thru Manesseh is for Lehi and his family, Joseph thru Ephraim is for Ishmael and his family.  According to Joseph Smith as told to Erastus Snow, this is from the 116 pages that were lost by Martin Harris.  (Journal of Discourses, a collection of sermons by early LDS leaders, Volume 23, page 184).