You and your family are in my prayers. My Mom is a cancer survivor (of a very virulent form of bone cancer - multiple myeloma) - we live with a tiny kernal of fear in the back of our minds of recurrence. I know how hard it is to have a parent seriously ill.
Hang in there. Hug your family tight. Cry as you need to. Watch a funny movie (Blades of Glory was seriously stupid but funny). Take good care of yourself and know that you have friends here.