Father in law with metastatic lung cancer. Has fallen 3 times and now on walker. Any estimate on time left.

I can't estimate it. Which type of lung cancer does he have? What grade is it? Here are some stats for small cell lung cancer and non-small cell lung cancer: See: https://www.cancer.org/cancer/non-small-cell-lung-cancer/detection-diagnosis-staging/survival-rates.html **** https://www.cancer.org/cancer/small-cell-lung-cancer/detection-diagnosis-staging/survival-rates.html.