Doctors have many patients, and it sounds like he fit your son in without an appointment, although it took a very long time.
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I respectfully suggest you consult with a qualified malpractice attorney before any such meeting. What actions should have been taken by the family practitioner depends on the details of your son's medical history and presentation. In particular, was his chest pain consisted with a cardiac issue. Further, if there was any harm by the delay is a critical question, what was the ultimate outcome?
Generally, I would ask for an explanation for the delay and the staff's actions. Who was responsible. I would also ask why your son was not referred for emergency medical service, and what the doctor's office's capabilities are to diagnose and treat a cardiac emergency.
Of course, this is not meant as legal advice nor does it establish any professional relationship.