Final answer:
Parents should inform their 4-year-old about their older child's hospitalization using age-appropriate language, providing reassurance and maintaining family unity during the stressful event.
Step-by-step explanation:
The best response by the nurse to the parents wondering if they should tell their 4-year-old son about his older brother being in the hospital for an emergency appendectomy is c. It is important to tell their 4-year-old son about his older brother using words and terms that he can understand at his age. Children at this age can often sense when something is amiss in the family and might benefit from an explanation that is tailored to their level of understanding. A simple explanation that avoids overly technical terms can help reassure the child and maintain a sense of family cohesion during a stressful time.