My Mother was diagnosed with terminal bowel cancer mid January. She lasted until early June in a care home.
About a week before she passed away, she started getting quite confused - up until that point she was absolutely fine - eating, drinking, totally compus mentus.
I mentioned to the care home Manager she seemed more confused, she agreed and kindly suggested all of my sisters and I may want to spend as much time as possible with her. We saw her a few days later and she wasn't eating, sleeping loads and kept saying she was itchy (her kidneys were shutting down). When we said goodbye to her, we held her hand and her hands were very cold - we later realised that it was her body trying to survive by drawing heat from all "non vital" parts of her body.
My sister saw her three days later - she was essentially unconscious and her breathing was apparently "rattly" - she passed away 3 hours after my sister left her.
It was incredibly upsetting - but we were comforted knowing that she wasn't in pain, we'd all told her we loved her and right up until the end the standard of her care was excellent.
Having never had a loved one pass away from cancer, we had no idea what to expect - I found the NHS website quite helpful and could actually tick off most, if not all of the things it suggested happened at end of life as my Mother exhibited all of them.
Right at the end, the care home played music and put all our photos on her bed. Apparently the hearing is the last thing to go? I'd absolutely do whatever you feel will give you peace and if possible, make sure your Father is as comfortable as possible.
I'm very sorry for what you're going through and wish you a lot of strength in the coming weeks.