The wife of your 75-year-old client comes to you with the concern that her husband has decided to make himself a DNR in his advance directives and does not wish to be resuscitated if his heart stops or he stops breathing. He was diagnosed in early stages of dementia last year, and she is afraid that he is "not in his right mind" to be able to make this decision. What would you share with the wife in regard to his rights in the advance directives decisions? How can the nurse help the wife in this situation?