Alf’s trip to Canada appears to have been in two parts, where he accompanied his mother. The Norwegian emigrant records indicate he left on the “Oslo,” which was on the Kristiania-Hull run; Canadian passenger records indicate he arrived on the “Tunisian,” from Liverpool to Montreal. The UK outgoing passenger records verify the departure from Liverpool, but the UK records don’t include information on incoming passengers from European ports, so there’s no verification of that portion of the trip.