Joseph Smith, III to Succeed Father for Prophet
http://www.centerplace.org/history/ch/v2ch35.htm
There are many testimonies and evidences showing that Joseph Smith, Jr. did in fact bless his eldest son Joseph Smith III to take his place if/when he died. The following list is just a microcosm of the testimonies, excerpts from private journals and letters to newspaper editors from various people testifying to a number of times Smith publicly announced his intentions of who should run the Church.
This first link below provided copies of no less than eight different statements testifying that JS III was supposed to fill his father’s shoes.
http://home.earthlink.net/~jptandy/rlds/js3.htm
http://www.centerplace.org/hs/dc/rdc-043.htm
http://restorationbookstore.org/articles/heritage/articles/josephsmithsuccessor.htm
http://archive.org/stream/mormonismunveile00leej#page/154/mode/2up/search/Joseph+Smith+III+ (Mormonism Unveiled, pg 155, John D. Lee)
No Man Knows My History, pg 381-382, Fawn Brodie
Also see:
Law of Prophetic Succession
