Harriet was the daughter of Robert Chew and Elizabeth R. Smith. She married Dr. Joseph Deane Barnes on 12 January 1875 in the District of Columbia. They had four children, Elizabeth C., Joseph F., Robert C., and Mary F. Barnes. She was widowed on May 13, 1882.
Harriet married second Rear Admiral Francis MacKall Gunnell on May 29, 1891 in the District of Columbia. She was widowed again on June 10, 1922 (findagrave.com)