Alvin Smith was the eldest brother of Joseph Smith, founder of the Latter Day Saint movement. Alvin took a leading role in helping the Smith family work toward paying their debts and building their home. His death at age 25 resulted in his younger brothers Hyrum and Joseph taking more of a leading role in family affairs. A vision by Joseph Smith showed Alvin, who was not baptized while alive, in the celestial kingdom, which is the highest of the degrees of glory. His presence in the life of young Joseph Smith and in that vision played a significant role in the establishment of the Latter Day Saint doctrines of redemption of those who die without a knowledge of the gospel, as well as the practice of baptism for the dead in the Church of Jesus Christ of Latter-day Saints.

Joseph Smith Jr. was an American religious leader and the founder of Mormonism and the Latter Day Saint movement. Publishing the Book of Mormon at the age of 24, Smith attracted tens of thousands of followers by the time of his death fourteen years later. The religion he founded is followed to the present day by millions of global adherents and several churches, the largest of which is the Church of Jesus Christ of Latter-day Saints.