Hi Minny, so very sorry that you find your self in this situation with your dad. I know nothing about final stage care for PCa sufferers but my mother passed away with lung cancer in a hospice and although you know the end is near I tried to get as much " time" with her as I could, with every memory being stored.
Stay strong for your dad you are a wonderful caring daughter and I know you will do whatever you can to make his last period of this crap disease as good as you can.
My thoughts are with you at this time.
Chris/Woody
Life seems different upside down, take another viewpoint