Hi Julie.You will find Michael listed among Cornelius' children in Maple Grove in the 1870 Census.
I have not consulted any Massachussetts records, so I haven't seen any birth info or marriage info from that state.Do you have an exact date of birth for Thomas and complete marriage info for Cornelius?
I find Mary still living in Minneapolis 1910.She is indexed as "Mary Hesson."
I am relying on a now-misplaced family history written by a long-dead relative to place Mary among the Keef or O'Keefe family.Her parents were supposedly Thomas O'Keefe and Ellen Shedy.They were my wife's g-g-grandparents.Mary's nephew was my wife's grandfather, and his obit calls his aunt "Mrs. C. Gleason."
That's all I have to connect her to the O'Keefe family.It would be nice to have her marriage record as well.Can you give me some kind of link so I can reference it?