You have received some very good, sound advice from others on this site. PLEASE insist on better pain management. Our Dad had a port, with morphine available at the push of a button. In my opinion, there's no reason for your Father to suffer with that much pain.
Dad came home after a brief stay at hospice. He was home for 4 months before he passed (one year after diagnosis). He slept a lot. When he was awake, he wanted someone laying with him, or at least holding his hand. He had recurring halucinations, which we thought were dreams, but realized he had them while awake, as well. They were always the same -- he was standing in his living room, but there was no floor. I can smile now, as I remember the look of surprise, mixed with confusion & awe, as he experienced them. He would often call out & ask "Hey -- do you see that?!" And he always said, "Well, I'll be damned", as if he was amused.
He had some extremely tough days. Some very bad days. But I think the worst was probably a couple of weeks before his death, and had more to do with his emotions & fear, rather than physical suffering. He was still mentally aware; and talked to each of us kids individually, to make sure we were okay. That was quite a gift. Just a few days later, he began needing so much morphine to stay comfortable that it became difficult for him to hold a conversation for any length of time. (And boy was he cranky when they started wearing off!!)
The morning Daddy died, his wife, my brother and my husband were with him. My brother noticed a clear change in Dad's breathing & confirmed his suspicion on Dad's monitors, so he woke Cora. She came and layed in the hospital bed (which was in their living room) with him & he opened his eyes for just a second. He put his arm around her, and passed about 10 minutes later. He simply went to sleep, holding his wife.
I pray that your Mom & Dad are able to experience the same peaceful end to such a horrible illness.
God Bless