FAIR is a non-profit organization dedicated to providing well-documented answers to criticisms of the doctrine, practice, and history of The Church of Jesus Christ of Latter-day Saints.
Mormonism and church leadership/Succession
Succession among Church leadership
Succession in the Presidency of the Church
Summary: There was much contention regarding who Joseph Smith's successor was supposed to be after his death. Some claim that Joseph Smith designated his son Joseph III as his successor.
Seniority in the Quorum of the Twelve