Let this be the official word:
If I am unable to make or communicate decisions regarding my health care, and IF (i) I have an incurable or irreversible condition that will result in my death within a relatively short time, OR (ii) I become unconscious and, to a reasonable degree of medical certainty, I will not regain consciousness, OR (iii) the likely risks and burdens of treatment would outweigh the expected benefits, THEN I direct that my health-care providers and others involved in my care prolong my life as long as possible within the limits of generally accepted health-care standards until ANY member of my immediate family decides that the medical treatment costs would outweigh the expected benefits. I direct that the best medical care possible to keep me clean, comfortable and free of pain or discomfort be provided at all times so that my dignity is maintained, even if this care hastens my death.
Link: All Law – Forms – Wills and Trusts – Power of Attorney for Health Care.