[Serious] Is he actually getting better?

Hello to whoever is reading. My dad was diagnosed with bile duct cancer in February and started chemo quickly. He was tired, yellowish, and had a loss of appetite throughout the beginning stages. There was good news and bad news. The good was that the main area of the cancer was recessing but the bad was that, since bile duct is very aggressive, more spots had opened up. His legs, kidneys, live, and stomach had all scanned as positive for cancer cells. With this much in him he is going to die from it and they estimated 1 to 2 years left. Idk if you believe in God but that is the only way he can be cured. They started chemo again and my dad is walking better, eating more, and not as tired. I’m one who believes in false hope and I try not to believe that he is going to get better. My question is that could he be feeling better but be getting worse and he wouldn’t know it? Or could he actually be getting better? Thank you