You have to deal with both the parent and the surviving or healthier spouse as well. And that may mean re-training them on how to live and care for the person who is afflicted, from giving them medicine, knowing where the doctors are, scheduling appointments, getting them to the appointments, home services, and tests. You may also have to work with them so that they are able to pay for bills and prepare meals if they have never done so in the past.
When you have medical power of attorney for a loved one, it is vital that you understand fully what kind of care he or she may need. Meet with doctors and openly discuss and learn about the medical conditions that your parent or other relative or spouse may have.