Thank you for concerns and caring words for my father. His condition and response seem to be improving in recent days. We will keep watching.
Incidentally, my uncle Shizuo (my father's elder brother), who had Parkinson's disease and long hospitalized, passed away a few days ago. Maybe he is telling my father to stick around?
Frankly, I am not certain what to wish for my father. But we will certainly try to bring good news for him.