Hi, I'm a lurker (mostly over on MM) but just wanted to say how sorry I am about your father's possible illness.
My father (also pretty young - only 56) has just been diagnosed with cancer for the 3rd time in about two years. He's been in the hospital for a month straight because his colon/bowels are completely blocked. He has colorectal cancer.
Having an ill parent is a really awful thing to experience, and my thoughts are with you.