When Susan M. Middleton was born on 5 November 1860, in Ohio, United States, her father, John C. Middleton, was 29 and her mother, Mary Alnetta Blue, was 28. She married Philander Caleb Brooks on 6 July 1879, in Webster, Iowa, United States. They were the parents of at least 2 sons and 6 daughters. She lived in Washington Township, Marion, Indiana, United States in 1870. She died on 30 September 1950, in Major, Oklahoma, United States, at the age of 89, and was buried in Rusk Cemetery, Rusk, Major, Oklahoma, United States.