There's a story about the Keg Mansion in Toronto, try this:
http://www.torontoghosts.org/kegmansion.htm And let me tell you, I've been in the Keg Mansion a thousand times, and I've only been the bathroom alone once. Never again - talk about freaky feelings!
You might want to look up Hart House on the U of T campus - I seem to remember hearing something about a haunting there (try this:
http://www.news.utoronto.ca/bin6/051031-1753.asp).
There are tons of books on Ontario/Canada hauntings - there are even a bunch of "Haunted" walks all over. I heard that the one in Ottawa was quite good, as well as one in Toronto, where they FEED you along the way!
Where in Ontario is the house that you were talking about?