To be clear cyberjesus (may I call you Lord?), in using the word 'respect' I did actually mean respect as in acceding to their wishes.
TimDrake, maybe I didn't explain myself well enough. In the unfortunate scenario described it is me (or you) that makes a choice. I'm not making someone else's choice I'm making my own. I have to live with it. Even if I agreed to deny a blood transfusion because I know it's what my Mum would want that would still be my decision - the fact that it aligns with another person's wishes is not the point.