Attention, random parents of America!
Please understand something — if you have an appointment for one child, that means you’re paying for the services rendered for that one child. If you bring along a sibling without an appointment, and then ask me to examine them for some concern (no matter how brief or minor it may seem to you), you are asking me to defer payment for my professional services simply because you asked for it. It is really no different from strolling through a supermarket and helping yourself to a small item or two without paying for it, and expecting the store to write off the loss because you did pay for some other groceries. It is deeply inconsiderate, and forces me to either give you something for free that you should be paying for, or disrupt an otherwise easy physician-patient relationship by calling you on this behavior and charging for the service.
This is a rare enough phenomenon that I just grin and bear it. But just like nobody drives two cars to the garage and expects two oil changes for the price of one, or asks a lawyer to draft a will gratis because they’re already getting paid to review a contract, asking me to check a brother’s ears or listen to a cough is requesting something for nothing just because you feel entitled to it.