SS Sicilian - June 1916 Montreal to Liverpool

Hi My grandfather, Leo, travelled on the SS Sicilian to Liverpool as an 8 year old under his stepfather's surname of Knight, with his mother Mary Knight and his step father William Knight (who was listed as one of nine British Naval Ratings on Board). Records state the ship sailed from Montreal arriving in Liverpool on 23 June 1916, but my father always stated the family sailed from Boston. I have been trying to find out if the SS Sicilian sailed from Montreal stopping at Boston before heading to Liverpool. Any help would be appreciated. Many thanks