When parents are present, they are responsible for their children. The intention of the parent to be on-site was to register the child, not to seek medical care. The ER staff either did not really say what that parent stated, or they are ignorant of what really happens at a school. You are not a primary care provider, nor are you an ER triage nurse or MD. Don't let bully parents get in your head. You gave prudent care and suggestions. The parent just felt guilty for not making their child eat prior to attending registration.