What do you suggest if my father has late 4th stage emphizima and late 3rd early 4th stage adenocarcinoma (small cell lung cancer)?

Deepest condolences: It sounds like your father's time is short. Make it as good a quality time as possible. Talk to each other. Tell him that you love him. If he was a good father, tell him. Ask him to provide a life history for you - video tape it if possible. Consider Hospice care. Be sure you discuss and know his wishes for mechanical ventilation. Be sure he has a will.