Hiro-sama
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
I'm really worried about your father.
Did your father not specify anything on informed consent when visiting a medical institution?
As a recent trend, there are cases where we confirm the person's intention regarding the notification, especially at the time of the first diagnosis, so I hope you can confirm that a little bit as well. If the father refuses to make an announcement, making an announcement may be contrary to the person's will, and I know that it is necessary to be careful about that.
If there is no specific clarification on the person's informed consent, recently, there have been many medical institutions introducing palliative care, and I know that by making an announcement, you may be able to meaningfully spend your life expectancy while receiving palliative care while respecting the person's intentions.
Of course, I think it would be better to decide on this announcement based on agreement between families as much as possible in order not to leave grudges later. Naturally, the intention of the mother, who has been with her for many years and is fully familiar with her father, cannot be ignored. Once again, I think it would be good to have enough discussions with the mother once again, and if necessary, discuss and make a decision with the doctor and other family members.
“Aibetsu Farewell,” which is the pain of having to break up with someone you love... I have honestly been treated a lot about this suffering even in my questions up until now.
Regarding the death that will eventually come, ask “I don't know how to treat my father with terminal cancer” (http://hasunoha.jp/questions/227), and until now, about death with dignity, the question “about death” (http://hasunoha.jp/questions/324) · question “every day of regret” ( http://hasunoha.jp/questions/172) ・Each question is dealt with in “Suffering at the End” (http://hasunoha.jp/questions/95), so I hope you can take a moment to refer to it if you like.
Kawaguchi Hidetoshi Gassho