N.Y. Public Health Law § 2994-D
1. Identifying the surrogate. One person from the following list from the class highest in priority when persons in prior classes are not reasonably available, willing, and competent to act, shall be the surrogate for an adult patient who lacks decision-making capacity. However, such person may designate any other person on the list to be surrogate, provided no one in a class higher in priority than the person designated objects:
3. Authority and duties of surrogate. (a) Scope of surrogate's authority.
4. Decision-making standards. (a) The surrogate shall make health care decisions: