Parental consent is irrelevant.
Otherwise you not only risk patient safety, but also major federal regulatory headaches. I include a child that presents with the question of a fracture, or any other minor injury, in this same category. The MSE must be started to assure no more serious injuries are involved. The friend's mom takes the 2 boys, with permission, on a trip to a nearby mall. He is wheezing and using some accessory muscles but can speak in full sentences.