William John Sedgwick  (James Sedgwick / Betsy Unknown)
b. 1818 Newtownabbey, Ireland
d. 28 Nov 1891, Dysart Township, Victoria County, Ontario, Canada
m. 27 Jun 1839 Martha Dawson, Peterborough, Ontario, Canada
immigrated to Ontario, Canada before 27 Jun 1839
The best information on this family is at Susan Beyette's Rootsweb website:

Beyette Family Connections

251 Sedgwicks listed and many more descendants.

Descendants / Researchers:

Susan Beyette  beyette@kos.net
Website: Beyette Family Connections at Rootsweb.Ancestry.com