I am a little confused if my parents should come to Canada with the purpose of tourism or meeting their children. Of course both is in the agenda when they come here, but is it required for me to send them a letter of invitation? My parents can take care of their visit monetarily by themselves and my father also still runs a business in India. So do they still need our letter of invitation? FYI- My husband and I are PR of Canada. Please help me clear my doubts.