I don't have much expeience as EMT yet but letting some one intervene in professional care by stating that, he is a family member and also a health care professional ext... Can lead to lots of legal problems. A few to name are negligence and abandonment. Plus, if they are a health care professional, why would they bother calling an ambulance. Do what you have to do and drive them to the ED. But calling an ambulance then trying to help is proberly just a way for them to leave a blame on some one.
Just saying, still fresh in the field hoping to start paramdic school in a year.
Denny