Sorry to hear this.
I am a retired RN worked Hospice for a long time Try to understand that if you have someone in Hospice they are there not to make them better but to help them and you prepare for what has to happen and that is never fun for anyone.
A Hospice Nurse should be up front with you. if you father is awake and with it so to speak he will deserve to understand what is happening to him so he cam prepare.
Please don't think this is unfeeling or that I do not understand what you are going though. My Mother passed from CA shortly after placed in Hospice. I myself have The same CA so I see it from both ways
When your father feels it is the right time, he will pass. It is hard but you need to tell him you love him and also let him know you will be ok and when he is ready he can let go. Do this even if he is not awake we still hear. and we will stay here is this place suffering longer if we feel we need to stay for or loved ones.
There ARE things worst then death. Help your Dad let go try to be there with him but know you are doing the right thing by keeping him home he needs to know he can go
Im am very sorry you have to do this I have been without both my folks since 91. Not a day goes by that I do not think of them. Now more than ever as my Circle closes I understand this is a journey we all have to take.
I pray God sends his Angels to cover you and your family with their wings during this your time of need.
Hess