- Born December 6, 1835 in New York, New York.
- Parents were HUMPHREY BARRETT HEYWOOD and MARTHA WILLARD MERRITT.
- Married ELIZABETH LANG LOZIER on June 7, 1856. Elizabeth was born December 14, 1832 in New York, New York; and died March 31, 1925 in Groton, New York. She was previously married to RUSSELL ADEE. After Henry's death, she married DAVID BURST.
- Died June 25, 1871 in Brooklyn, New York.
- MARIE LOUISE HEYWOOD, born July 9, 1859 in Bloomville, New York; died June 29, 1909 on board a ship off of the Barbados. Married FRANK B. SEAMAN on April 24, 1877. Married HENRY POTTER McKENNEY on August 23, 1882.
- CLARENCE HENRY HEYWOOD, born November 11, 1861; died March 25, 1913 in North Harpersfield, New York. Married IMOGENE SNYDER on August 26, 1883.
- LOUISE JOSEPHINE HEYWOOD, born August 18, 1866. Married WILLIAM JACQUES on September 21, 1881.
- FRANCES JEROME HEYWOOD, born June 21, 1869 in Brooklyn, New York; died June 15, 1937 in Groton, New York. Married PHILA EVELYN CRANE HILL on February 20, 1895 in Groton, New York.
Descendants of John Heywood of Concord, Massachusetts by Freda Heywood Massara