My in-law's want to take our children (4 & 7) to Niagara Falls for a weekend trip over a school break in October. Does anyone know the procedures for crossing the border with grandparents? I think I read that they need their birth certificates and a notarized letter from us (the parents) stating they are traveling with their grandparents and have our permission to enter Canada. Anyone know otherwise? I don't want them to get there and have to turn back because they can't cross the border. All the fun stuff is on Canada's side!!