If the intention is for a temporary assistance and not long term, it is still wise to anticipate end of life events. It is really hard if you have to decide for them and do not know how much medical intervention you have to choose from if you have the choice. DNR/DNI (Do Not Resuscitate (ressucitate, resusitate,) / Do Not Intubate, spell checker has to add this to dictionary). (I was quite surprised that the Pope did not want to go to a hospital to prolong his life, with by all means possible.) There are a lot of medical interventions that can keep a person alive to a point of death and beyond in one sense via organ and tissue donation. There are questions about the financial resources, spiritual resources, social resources; there are a lot of answers that could be helpful. Most likely if the questions are not answered already by foresight then they may not be at all. Especially if they just want to be totally on their own.