Hi Pamela,
I am not researching this family, but on Ancestry.com Charles Seymour is listed in voters lists in 1938 and in 1949, as a moulder living in Prescott.
In 1908 there is a birth for a daughter Eliza in Morrisburg, which is in the united counties of Stormont, Dundas & Glengarry. That record gives the date of his marriage as 18 SEP 1907 at Morrisburg. It also gives him a middle initial of J. I am attaching a copy of the birth record to this reply. The handwriting is pretty bad for his wife's maiden name, but at least that should lead you to the 1911 census for the family, or earlier censuses for him with being able to differentiate by occupation.
There is no death record for him because of privacy laws since the 1938 deaths are the latest released. However, you may be able to find something in cemetery records.
You might want to contact the Grenville Co. Historical Society in Prescott for further assistance. They do research for a nominal fee and may be able to lead you to the newspaper for his obit, etc. Their website is:
http://web.ripnet.com/~gchs/ If you email them, please be aware that the volunteers are only in the library on Tuesdays during the winter.
Good luck!
Sandy in Omaha, Nebraska