Hi there. My Dad's grandfather was Murray Bliss Grant, James' son. I know that James was born in 1851 in NB and died in 1891. His wife was born March 21, 1853 in NB and died in 1953. James is buried in the Kilburn Cemetary in Victoria County. James' headstone reads "GRANT In Memory of James A. Grant d. April 18, 1891 age 40". "Marme" remarried a man named George Everett (not sure of the date) and my Dad grew up knowing her as "Grammy Everett". He and my great aunt indicate that her first name was pronounced as "Marmarie" although there doesn't seem to be any clear agreement on spelling :-) She is buried in the same cemetary but alongside George. And yes, according to family lore he was a section man for the CPR and killed in a railway accident in the Tobique.
Feel free to contact me if there is anything else I may be able to help you with.