the problem is not in his name.  It's in his SSN.  I suspect that the 17 filed his own taxes, and claimed himself on that return, not knowing he did not need to do that.  try to get a copy of that 17 yr old super genius's return, and I would almost guarantee that is what has happened.  if that is the case, then;

1) file an amended return for the 17 yr old tax pro, and change to where he IS claimed by someone else.  Unless he made a ton of money, should not change his refund one bit.

2), then wait...and wait..and wait a little more, and then paper file the parents return with the explanation of what happened and the child's return has been amended to reflect being claimed by the parents.