When Ethel C Hildreth was born on 10 August 1880, in Yakima, Yakima, Washington, United States, her father, Daniel H. Hildreth, was 21 and her mother, Margaret Olive Dietderich, was 20. She married Jacob Carl Aeby on 19 February 1901, in Vancouver, Clark, Washington, United States. They were the parents of at least 4 daughters. She lived in Englewood, Multnomah, Oregon, United States in 1930 and Election Precinct 394 Englewood, Multnomah, Oregon, United States in 1940. She died on 23 October 1971, in Portland, Multnomah, Oregon, United States, at the age of 91, and was buried in Wilhelm's Portland Memorial, Portland, Multnomah, Oregon, United States.