Sorry to hear about this and your family,You all are in my prayers.
Sound like some kind of contagious bacterial infection,could be Oral thrush,Strep throat or Mononucleosis.
Soft foods like bananas, plain (unsweetened) yogurt, and applesauce do wonders to help lead the patient back to health,and of course chicken soup.
I pray that they have a speedy recovery.
Martin
