The nurse is providing teaching to the parents of a child with varicella. Which statement indicates that the parents have understood the instructions?

"He can go back to school 24 hours after we start the antibiotic.”.

"We need to make sure that he washes his hands frequently.”.

"His sister had the vaccine so she can't catch it.”.

"If he has a fever, we can give him some acetaminophen.”. — . . .