William Martin Brinkley was my great-grandfather from Mount Airy, North Carolina. He was a member of The Church of Jesus Christ of Latter-Day Saints. He taught the Gospel of Jesus Christ to his family. Once he gained a testimony that The Church of Jesus Christ of Latter-Day Saints was the true church, he never denied.
Here is a copy of his one sentence testimony:
“I lay no claim as to living the Gospel of Jesus Christ to the fulness, but I have approached it near enough to know it is true.” (William Martin Brinkley)