Book of Mormon Student Manual, (2009), 409

While the Three Witnesses were not related to each other, the Eight Witnesses were very much interrelated. They were made up of the extended families of the Smiths and the Whitmers. Joseph and Emma Smith lived with the Whitmers on their farm. The Whitmers helped Joseph during the days of translation. Christian, Jacob, Peter Jr., and John Whitmer were all sons of Peter Sr. and Mary Whitmer. Hiram Page later married Catherine Whitmer, the oldest daughter of Peter Sr. and Mary Whitmer. Joseph Smith Sr., Hyrum Smith, and Samuel Smith were the father and brothers of the Prophet Joseph Smith.