Searching for these Irish parents of my great grandmother, Mary, since the trail runs cold for Mary who died in childbirth with 2nd child, Mary Bertram. The porous Canadian border makes it difficult to find when she immigrated with French Canadian husband, Frank Bartreau (Bertrand, Bertram) or when/where they were married. Her sister, Elizabeth, appears on U.S. census as born in Ireland to Irish husband, Thomas White.