Final answer:
The most appropriate nursing intervention when family members disagree about the treatment for a terminally ill comatose patient is to facilitate open and respectful communication among all parties involved.
Step-by-step explanation:
When family members disagree about the most appropriate treatment for a terminally ill comatose patient, the most appropriate nursing intervention is to facilitate open and respectful communication among all parties involved. This can be done by organizing a family meeting, where each family member can express their concerns, preferences, and understanding of the situation. The nurse can act as a mediator, ensuring that everyone has the opportunity to be heard and facilitating a dialogue that focuses on the best interest of the patient.
By creating a safe and supportive environment for discussion, the nurse can help family members understand each other's perspectives and work towards finding a consensus regarding the treatment plan. The nurse should remain neutral, providing information and guidance, while respecting the autonomy and values of the patient and the family.