Derrick's wife appears to be Elizabeth Sisson. According to http://www.ontariogenealogy.com/Northumberland/hope1b.html, "William SISSON, J.P., who claims to be [with one exception] the oldest male settler residing in Port Hope, came to the place in June 1823. In his time he has seen three or four generations pass away. He came from Duchess County, New York and is the youngest of a large family of sons and daughters. He commenced the manufacture of leather in Port Hope and carried on the business successfully up to 1852, when he retired, his industry having secured him a competency. He took a very active part in the management of the Durham Agricultural Society, having been its treasurer for forty years. He was also an active promoter of the first Mechanics' Institute. He was active in putting down the rebellion of 1837\38, having command of a troop of cavalry [attached to the Durham regiment] which he was instrumental in raising. He married a niece of Jonathan WALTON [one of the first settlers already noticed]. Mr. SISSON is somewhat remarkable in his locality for the very heterodox opinions entertained by him upon religious subjects."
Perhaps William was Gilbert's uncle (Derrick's brother-in-law), which may explain how Gilbert ended up in Canada where some of Gilbert's sons were married.
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