My dad was ill in a care home, got a call to visit his dr the next day, saw the dr who said your dad isnt well,(cancer) which i knew, so walked across to the home, which was opposite the surgery, he was like in a sleep, looked frailer than the day before, tried talking to him and he tried answering, mumbling etc, stayed for a while and said i will call back tomorrow.
Next morning got a call from the care home to say he had just died, while i was on the way there.
Got there, and he was lying on his bed, looked the same as the day before, got hold of his hand, and said hello, i couldnt believe he was dead.
Cried and the nurses walked in, said goodbye, walked out and hugged the care staff, cried again.
Day of his funeral, coffin back to my brothers house, he lay in the coffin in the front room, while we cried, chatted,passed coment on the woodwork of the coffin etc,etc(im a woodworker) and our family where undertakers.
If you cant face your dad face to face, just chat to the coffin and say goodbye, it does help.or it did for me.
Best wishes for the future and sorry for your bereavemnet