- Born November 9, 1800 in Dutchess County, New York.
- Married MARIA PRESTON. Children of this marriage were not descendants of John Heywood and will not be listed.
- Married SARAH HILL PERRY.
- Died March 6, 1874 in Baraboo, Sauk County, Wisconsin.
- ELLIOTT BROWN CALKINS, died October 25, 1893 in Baraboo, Sauk County, Wisconsin. Married LOUISA L. WELLS on October 11, 1863 in Lodi, Columbia County, Wisconsin.
- EVANDER CALKINS, born in 1840.