I'm with Newmama on this one. When a child is ill is no time to be worrying about who is "supposed to" be the caretaker. I'm sure if Nathan were asked, he would say he wanted his momma to take care of him. If you need to take care of a sick child, cancel the trip. Don't let work take precedence over your sick child. It sounds like Nathan is seriously ill. He should be watched carefully, and taken to the hospital if he continues to have trouble breathing.