James Carr married Eliza A. Duplisea who had a sister who married Mark Carr around the same time. It is likely that these two Carrs were either Cousins or brothers. James applied for 50 acres of land in 1853 in Sunbury Co. which he didn't get. I have found Mark Carr in Calis Washington Co. Maine, USA in the 1861 & 71 census so I am looking for James in the USA maybe they were with the railroad?, Also James son Cunard lived in Fairville, St John & there are tons of Carr's in that area.
In my grandmother Carr's birthday book there is a Mary Carr from Fairville, just a few bits & thoughts I have.