When Mary Benefield was born on 19 November 1839, in Indiana, United States, her father, Jesse J. Benefiel, was 40 and her mother, America Nash, was 28. She married Thomas B Eaton on 21 November 1861, in Sullivan, Indiana, United States. They were the parents of at least 5 sons and 2 daughters. She lived in Sullivan, Sullivan, Indiana, United States for about 10 years and Washington, District of Columbia, United States in 1900. She died on 14 January 1907, in Sullivan, Indiana, United States, at the age of 67.