My pops had cancer of the gallbladder I believe, may have been the deliver, not sure they kept me in the dark about it. What was scary is that his older brother died from cancer less than a decade before, and his mum also I believe. Though I vaguely remember doctors saying it wasn't a result of genetic predisposition.
Anyway, it wasn't pleasant, his treatment was mainly palliative. They gave him a couple weeks to live when he was officially diagnosed, but he managed a few months. His father died like a month before him. Seeing him suffer the juandice and acites wasn't pleasant. And the drugs definitely confused him, he wasn't himself after a while.
I'm learning to be less bitter/angry about unfortunate events that have happened in my life, and appreciate everyday as a blessing. I'm a survivor, we all are. Keep the faith in a better day.
Peace.