My Father gets confused and thinks I am not his daughter. Any advice?

My dad was angry and hostile last week when I wouldn't take him to his job sites from years ago. He was calling sis and I nonstop. We didn't respond or go see him for several days. We just texted his nurse to check on him. It seems to have passed. I went yesterday and all was well for now.

If this is a new symptom, it should be reported to his doctor. It could be a UTI. It could be a medication side effect. It could be his dementia deepening.

Is he living alone? It sounds as though that may not be enough supervision for him at this point.