Final answer:
The most appropriate intervention is to honor the DNR order of the client with a terminal disease as it is a legal document, despite the adult child's request. The nurse should offer emotional support to the family and involve relevant professionals for support and guidance.
Step-by-step explanation:
When a client with a terminal disease who has a Do Not Resuscitate (DNR) order stops breathing and loses a pulse, the nurse must adhere to the DNR as it is a legal directive given by the client. The situation is complex when a family member requests to ignore the DNR, but medical professionals must follow the advance directive unless there is a legally valid change. It is essential to have clear communication and understanding of the patient's end-of-life wishes, which should be legally documented and respected.
Nevertheless, this situation can be extremely distressing for the family, and the nurse must provide the appropriate emotional support and explanations to help them understand the situation and why the patient's wishes must be honored. It is also advisable to involve hospital ethics committees, social workers, or legal teams as needed in such situations.