My dad has colon cancer refuses for medical treatment. What should I do?

Oh. Ok, thank you jeannegibbs.

I am surprised that your father was willing to go for the testing, which I "assume" he did, for the diagnosis.

I personally would never do chemo but would he consider simply surgery to remove and then stop? My neighbor did that with her breast cancer. they removed the breast and she did nothing else. just a thought.