I filled in Matthew's profile with a little bio supported by familysearch documents. The military service was surprising because it was in Illinois. http://www.wikitree.com/wiki/Blaney-210
I suspect this record is Matthew's mother Mary dying in childbirth in Pittsfield. Her husband's name is given as John Blaney, Jr.
"Massachusetts Deaths, 1841-1915," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:NWSL-58D : 10 December 2014), Mary Blaney, 05 May 1847; citing Pittsfield, Berkshire, Massachusetts, v 32 p 34, State Archives, Boston; FHL microfilm 959,810.