The degree of difficulty will depend on the medical people you are dealing with and the persons circumstances. In theory there should not be a problem in most cases. The Guardianship Act says that when a person cannot make a medical decision for themselves then the...

Enduring guardianship ends when you die, or when you revoke the appointment. A joint enduring guardianship will also end if one of the guardians dies, resigns or becomes incapacitated unless you provide otherwise in the form. An enduring guardianship appointment is...

If the person you have appointed dies, resigns or becomes incapacitated, the Guardianship Tribunal can, in limited circumstances, order another person to be appointed as enduring guardian on your behalf. Someone will need to lodge an application on your behalf.