Jacob married Grace Stearns on 28 May 1815. Grace (daughter of Jonathan Stearns, Sr. and Mary Bigelow) was born on 19 Jan 1790 in Waltham, Middlesex, Massachusetts, USA; died on 10 Sep 1849 in Waltham, Middlesex, Massachusetts, USA. [Group Sheet] [Family Chart]

1. Prentiss S. Barnard was born on 4 Apr 1816.
2. Susan Barnard was born on 28 Sep 1818.
3. Henry Barnard was born in Apr 1820; died in Jul 1820.
4. William H. Barnard was born on 10 Sep 1821; died on 27 Apr 1834.
5. Mary Jane Barnard was born on 20 Jan 1823.
6. Benjamin F. Barnard was born on 10 Jul 1824.
7. James Barnard was born on 28 Nov 1825; died in Jul 1826.