When Mary Ament was born on 17 January 1859, in Palmyra, Marion, Missouri, United States, her father, Joseph Pettus Ament, was 35 and her mother, Sarah Jane Ruff, was 27. She married Reverend Charles Henry Seymour on 5 June 1889. She lived in Groveland, Essex, Massachusetts, United States in 1900 and Melrose Highlands, Melrose, Middlesex, Massachusetts, United States in 1940. She died on 11 June 1944, in Melrose, Middlesex, Massachusetts, United States, at the age of 85, and was buried in Wyoming Cemetery, Melrose, Middlesex, Massachusetts, United States.