I am sorry to hear that, Rob.
My sister was diagnosed with lung cancer last December. They took out 1/3 or so of her lung, she just finished the first round of chemo. The doctors told her, the one tumor they couldn't get with the surgery, has shrunk alot, it is almost gone. She is now supposed to start a second round, but a shorter one, to get this little speck of tumor, thats left.
My thoughts and prayers are with you.
Take care of your dad and yourself.
I may have been dealt a bad hand, but at least I'm still playing with a full deck. ( most of the time anyway).