When Ethel Sproul was born on 8 October 1903, in Washington, Washington, Utah, United States, her father, Andrew Sproul III, was 34 and her mother, Eveline Jane Chidester, was 35. She married David Leonard Prince on 2 January 1923, in Washington, Utah, United States. They were the parents of at least 3 sons and 6 daughters. She lived in St. George, Washington, Utah, United States in 1920 and Northeast Gooding Election Precinct, Gooding, Idaho, United States in 1940. She died on 4 February 1974, in Gooding, Gooding, Idaho, United States, at the age of 70, and was buried in Elmwood Cemetery, Gooding, Gooding, Idaho, United States.