Well... Madeline isn't going to be much help I don't think!
I've looked at the 1861 Census. Here is the household:
E.C. Zimmerman, born Lower Canada (ie Quebec), age 27, widow; with her sons John, 12, and Richard, 10, both born Upper Canada (Ontario). Also a Miss S. Dunne, b Lower Canada (marked as family, possibly E.C.'s sister), and C. Dunne, 48 (single, poss a brother?). In addition to the family, you have Mrs. Gillmore, married (husband not listed); Margaret Hennessey, servant, born Ireland; then Madeline Lachine, 18, born U. Canada.
Any other leads??