According to the Parish Record Collection - Somerset Marriages (post-1754) via findmypast, Jesse Williams of Weare parish was married to Mary Urch on 19 Mar 1829 in Wedmore, Somerset.
In a posting from RootsWeb there has been a transcription of a Bible Christian Magazine death notice as follows: Mary WILLIAMS died at Ninth Concession, Darlington Twp. the 1st October 1837 (wife of Jesse Williams from Weare Circuit).
Jesse and George Williams are living in 1852 in Darlington Township, Durham County, Canada West Enumeration District/Ward 5 page 119 lines 10-16. The census record for the family is:
Jesse Williams Farmer Eng B Chris 50 Lucinda Williams Spinster U States B Chn 43 Thos Teroine Labr Can B Ch 18 George Williams Labr Canada Bib Ch 16 Jane Williams Nurse Can Bib Ch 9 Jesse Williams Child Can Bib Ch 5 Wm Williams Inft Can Bib Ch 1