When Mary Ann Guernsey was born on 3 May 1813, in Poultney, Rutland, Vermont, United States, her father, Chauncey C Guernsey, was 39 and her mother, Lucy Hoyt, was 33. She married Parsons Clark Hastings on 2 June 1842, in Rochester, Monroe, New York, United States. They were the parents of at least 1 son. She died on 23 August 1847, at the age of 34.