In many instances a hospital will look to the patient's spouse to make those decisions. Occasionally they will look to a parent. Very rarely the hospital will look to a child or children who are in agreement. However, the appropriate thing to do is to file an emergency petition with the probate court to have someone appointed guardian of the patient to make those decisions. The court will want testimony as to the patient spoken wishes regarding life support and extraordinary measures for prolonging life and regarding his or her stated wishes regarding termination of life support. The court will then determine the limits of the guardian's authority to make final decisions for the patient.
Answered on Nov 14th, 2016 at 5:26 AM