When Clarence Oscar Eidsmoe was born on 13 April 1883, in Wisconsin, United States, his father, Almen Adelph Eidsmoe, was 19 and his mother, Annie Marie Arneson, was 19. He married Anastasia Truhler on 8 October 1907, in Minneapolis, Hennepin, Minnesota, United States. They were the parents of at least 1 daughter. He died on 14 October 1971, in Milwaukee, Milwaukee, Wisconsin, United States, at the age of 88, and was buried in Calvary Cemetery, Sheboygan, Sheboygan, Wisconsin, United States.