I will be praying for you, your brother and your mother. This is NOT an incurable and inevitably fatal problem. On a practical level, the first thing you will need to do is find out exacly what KIND of lung cancer you are dealing with-- this will be done with a bronchoscopy under local anesthesia-- once they ahve that information, then you learn about treatment options.
there was a Confederate general with the improbable name of Roberdeau Wheat. Shot through the lung at the first battle of Manassas, what us Northerners call Bull Run. The doctors told him that he was going to die. But I don't FEELL like dying right yet, he said. I'm sorry, said the doctors, there is no case of anybody recovering from your kind of wound. Well (said the lawyer turned general), I will put my case on record.
He made a full recovery.
The second time he was hit, (which I think was Sharpsburg) he was shot through the heart. Nevertheless. . .
Never give up. Never give up. Never, never, never give up. (Sir Winston Churchill) please let us all know what's going on as you learn more. You have LOTS of friends (and a few curmudgeons) wanting good things for your family, and Asking for them.