I found Michael and Bridget after they left Wolfe Island, Ontario. They were still there on the 1871 Canadian census, along with the younger children Mary, John, Michael, and Julia (aka Judith). In 1880, Michael and Bridget Comerford, along with Mary, John, and Michael (the son) are all in Dublin Township, Swift County, Minnesota. Their occupations are listed as farmers, there are no spouses indicated for any of the three kids, but there is also an Emma, born 1874 in Ontario residing in Michael's household. I am guessing that Emma is a daughter of either John, Michael Jr. or Mary. Mary did marry in Wolfe Island to a John Smith on 7 Jan, 1875, but there are no further records for her in Wolfe Island. She might have been widowed by 1880 and had moved back in with her parents. I am pursuing this link to get any further information on this part of the family from a free Swift County researcher nd will let you know.
Further note on Emma: an Emma Comerford married Patrick J. McMahon 29 October, 1895 in Minneapolis. Now Swift County is in the southwestern part of Minnesota, quite a ways from Minneapolis, but the name and age appear to be about right.
Final comments: There are several death records in Swift County during the 1920's and 1930's for Cumerford, Comerford, and Commerford. I have no verifed links to any of these so far.
I hope that you still occasionally check these Boards.
Your cousin, Beth. Note change in last name and e-mail.