I was under extreme stress that my sister gave me. I did not have the letter notarized and/or witnessed by anyone when I gave it to the rehab center. A friend of mine told me that in Illinois, it was not a legal revocation due to it not being witnessed, notarized, or on a legal revocation of POA form (which needs to be notarized). My sister was verbally attacking me via text on a constant basis, threatening me with attorneys, felonies (there have been none, but she still threatened.) It was so overwhelming, that I wrote the letter under duress. My sister kept mom hidden from all family and mom's pastor when she got wind of it. Well, I found out where mom was when the sister transferred her to a new rehab after mom's 2nd mini-stroke. They called me for info. My sister never picked up the call or called them with it. I talked to the new rehab that the letter was not legal in IL ... they are bringing it to their law team once I said I will hire an attorney. I "should" have an answer by 5pm...but what other recourse can I take?