Two on-line Ancestry Public Member Trees tell us that Ella died in 1931 and the Hummell tree tells us that the daughter died in 2003 in Belleville.
http://search.ancestry.com/search/db.aspx?dbid=1030Eliza May Seymour (Ella) died in Brockville in 1931 and was buried in Morrisburg.
http://search.ancestry.com/cgi-bin/sse.dll?indiv=1&db=on...The Rootsweb Obituary Daily Times – Database confirms that the daughter died in Belleville in 2003 and that her obit was published in the Belleville newspaper on April 17th.
HAIG, Eliza Irene (SEYMOUR)[STEVENS]; 95; Belleville ON; Belleville I; 2003-4-17
They also have an obit for Charles John Seymour, who died May 16, 1967.
http://bellevillelibrary.ca/photos/custom/genealogy/14Obit%2...You can ask the Belleville Public library to look for their obits for you.
http://bellevillelibrary.ca/genealogyc223.phphttp://bellevillelibrary.ca/fee-based-research-c4406.php