I'm planning to send my son (7 years old) to Canada during the summer. He will be traveling alone on his way there and he will be returning with his aunt, uncle and cousins. He has a National Passport and a Green Card (AS8). Will he have any problem traveling. Does he need an authorization and where can I get it (becuse of his age) Colombian embassy? USCIS? Canadian Embassy? Or just a notarized authorization? Any inputs are welcome.