On 1 Aug 1780 Isaac married Elizabeth Clark (48331) , daughter of Hezekiah Clark (31000) (ca 1723-ca 1776) & Mary Peck (30751) (18 May 1726-8 Mar 1799). Born on 9 May 1762 in Bethany, CT. Elizabeth died in Woodbridge, CT, on 6 Jan 1859; she was 96.