How can I dissuade a friend's parents from moving to another country my friend will be 16 by the time they move and does not want to leave I'm open to all ideas no matter how drastic?

If you and your parents/caregivers are willing to take your friend in this might be agreeable to his parents given that at this age school friends are so important. But I wouldn't hold out a great deal of hope that this will be a winning argument. Family ties are as important if not more so. Best of luck if this is what you and your friend want.