A mother tells the nurse the 7-year-old sibling of her child diagnosed with cystic fibrosis is having difficulty in school, fights frequently with playmates, and throws toys. Which of the following is the BEST response by the nurse?
1. "Did your child have these behaviors before his sister was diagnosed?"
2. "That is typical of 7-year-olds."
3. "Spend time with each child daily and it will stop."
4. "He is jealous of the attention his sister is receiving."