Hi FintryGirl:
My Mumfords lived in Toronto (and the neighbouring areas). I didn't take the time to reread my thread, but if I didn't previously mention it, our Mumford families lived in Essex, England prior to their arrival in Ontario. The families arrived in Ontario c1850s.
Does any of the above sound like it could be for your Mumfords? Please feel free to pm me, if it would make it easier to correspond.
PS My ancestor's uncle did not live in or around Toronto, so perhaps their could be a connection between our families. Also, this Mumford married an Isabella (I don't remember her last name or recollect dates, but I can look for the details if you have interest).
Thank you for your interest, Lisa