Can My Sister Still Use An Old Medical And Emergency Property Authorization To Lock Me Out Of Our Father’s House After He Revoked It Verbally But Never Updated It In Writing?

Location: North Carolina

My father had a stroke last fall, survived, and spent about six weeks in rehab before coming home in January. During the initial hospital chaos, he signed a stack of papers naming my older sister as the main contact for medical updates and giving her limited authority to handle urgent issues at his house because she lived closer at the time. I live about 45 minutes away and was still helping constantly, just not as the official point person. After he got home, the situation changed a lot. He was mentally sharp, handling his own banking again, going to follow up appointments, and repeatedly telling both of us that he did not want my sister "running everything" anymore. He said this in front of me, my aunt, and his physical therapist. He gave me a key, told me to help with groceries and paperwork, and had me start organizing his medications and mail because my sister had been throwing things away that she decided were "stressful" for him. We argued about that more than once. My father kept saying he was going to redo the paperwork, but he moved slowly, hated lawyers, and then had a second hospitalization in March. He is alive right now but back in a facility and not really able to manage conversations the way he could in January.

Last week I went to his house because a neighbor called and said packages were piling up and the side door had been left unlocked. My key no longer worked. I called my sister and she said she changed the locks "for safety" and that I was not allowed in because she is still the authorized person on file from the first hospitalization. She also told the rehab facility that I am "causing confusion," and now they will barely tell me anything beyond basic condition updates. Here is where it gets worse. A bank letter that was forwarded to my apartment by mistake shows she may have tried to close one of his credit cards, and the neighbor says a junk hauling company was at the house two weeks ago removing boxes from his office. I have no idea what was taken. I am not trying to start a family war, but can an old limited authorization like that still give her control over the house and records once he came home, resumed making decisions, and clearly said he did not want her acting for him anymore, even though he never signed a formal revocation?