On 1 Mar 1795 when Thaddeus was 25, he married
Eunice Mather, daughter of
William Mather (21 Nov 1747-1835) &
Rhoda Marvin (28 May 1749-1835), in Sandisfield, Berkshire County, Massachusetts.
Born on 20 Dec 1776 in Southwick, MA. Eunice died on 14 Apr 1858; she was 81.