My parents have some kind of specialized Power of Attorney (I am not sure what the exact Conservatorship is called in Canada) over my grandmother, who has Alzheimer's.
They are keeping her at home with them (although they do have home aides coming in to help) because they are loathe to put her into a Facility - it's really uncommon among people of their ethnicity and so they're still uncomfortable with this Western idea. Anyway, they needed it to enroll her in certain experimental drug studies (Phase III I believe), because she could not make the decision for herself anymore.