Not sure our Nicholson connect but; I have my Great Great Grandparents living in Cambridge & Dorchester, MA from County Armagh in Ireland; Joseph A. Carberry(Cabrey) & Mary Ann Nicholson. They lived on Brookvale Street in Dorchester, MA and Mary's brother James lived a street down on Patterson St with his fam. Believe they had a brother Thomas who married in Ontario. Mary was supposedly the only daughter out of a bunch of brothers all from Armagh, IRE. Was always told through Mary that I and my fam are related to the Nicholson's of Canada.