I'm really sorry to hear that you're going through this. I mentioned before that I just moved back home where I grew up and one of the first things I was immediately confronted with is my closest cousin, someone more like a brother and best friend was diagnosed with Cancer. Also stage 3 or 4 and he has several large tumors. We don't have all biopsy results back yet so the full prognosis can't really be done, but so far it's sort of been bad news after bad news. He's only 37 years old, has three children and one of them(the youngest) is autistic and has special needs.
It's been a lot to deal with so I feel your pain. I hope everything works out for your family and wish you all the best.