Dear friends, My dad and mom got a visit visa to canada. Initially they were planing to leave for canada one month after stamping of visa. But now due to some unavoidable circumstances they have to postpone their departure for three months therefore could someone please advice that can they leave for Canada 3 or 4 months after the date of stamping as the visa is valid for 6 months or do they have to take permission from the Canadian visa office if they are leaving after 3-4 months of stamping? if yes then who they have to write to? Please help.