Please teach your children to cover their mouths when they cough. Teach them to wash their hands after using the bathroom. Teach them to sneeze away from the people in the room and to cover their mouth and nose when sneezing. Furthermore, if your child is sick enough to be coughing and sneezing all over the place, perhaps you should make them stay home from violin lessons. As long as you cancel in advance I’m pretty sure the teacher won’t mind rescheduling in order to avoid being exposed to your germy little sick machine.