When Jim is better and able to handle his affairs, the first priority should be for him to designate Chris as his representative for medical purposes (medical power of attorney) and, if he has not done so, prepare other end-of-life forms that represent Jim’s wishes.
It is a huge mistake to put you wishes on a form as situation change and the form will be used against you to end your life prematurely. The better way is to designate someone who kniws his beliefs and will fulfill his wishes and stand by him.