my father is 92 and just diagnosed with colon rectal cancer with metastasis to the lungs and liver. He is diabetic and recently dx. with atrial fib. He has high blood pressure and has had a stroke in the past. He has been independent but has lost 20 lbs lately and is not eating well. We are thinking of not being very aggressive and allowing him to live out his life without treatment. He has no pain at present. Is this wise or would treatment help?