Without a more exact location in Ireland than Co. Antrim it will be very difficult to find any information. If you know the area in Canada they went to perhaps you will be able to find some clues there- death certificates, gravestones, newspaper obituaries/death notices, family Bible, etc. may have the name of the place they came from in Ireland (need parish if not actual townland). Often people came in groups or went to place where friends/relatives settled so might be clues in area.