Would this couple be the parents of Rose Anna, b. 1899, Laura, b. 1904, Marie Ivone, b. 1906 and Noel, b. 1909?
If so, I believe this is the Wilfred Imbault-dit-Mantha, son of Peter and Mathilda Nadow (Nadeau?), married to Mathilda "Fleurie", daughter of ?Amadee? and Mathilda Benoit, on 20 Nov 1892, at the Cathedral of the Assumption, Sudbury, North Bay.
On the 1891 Census, I find a Wilfred Mantha, age 22, living with parents Pierre and Mathilda in Cumberland, Ontario.I have not yet found Matilda Fleury, but the marriage record states that her parents are residents of Chichester, Quebec.
If this sounds like the right couple, I will be glad to send copies of the related documents to your email address of record, if you wish.