make sure to get a visit visa and process it to your choosed agency. most of the time medical will gives a problem to avoid people to travel anywhere in the world, if that happen and your parent cannot heal rapidly your visa will expire and your ticket will become useless.if every things OK then you book a ticket for your your parent.i travel so many times all over the world dear for 32 times i got an experience to fly with planes.that's the best i can suggest to you...