When Stephen Homer Vandiver was born on 28 December 1878, in Knox City, Knox, Missouri, United States, his father, Jasper Vandiver, was 36 and his mother, Fleckner Jane Smith, was 32. He married Mary Elizabeth "Mamie" Daugherty on 10 October 1900. They were the parents of at least 3 sons and 5 daughters. He lived in Greenacres, City of Spokane Valley, Spokane, Washington, United States in 1930 and Greenacres Township, Spokane, Washington, United States in 1940. He died on 18 January 1964, in Spokane, Spokane, Washington, United States, at the age of 85, and was buried in Spokane, Spokane, Washington, United States.