It must have been quite a shock to your system to hear about your Dad. I have a few links from before when I was researching different natural cancer treatments, including a "do-it-yourself" cansema paste (link #3). I know it's a bit tedious to look through a bunch of webpages, but you might see something here that you don't know of yet. Remember - there are always miracles. I believe GOD can heal the body in an instant - I've seen it with my own eyes!
May GOD bless you and your family.
P.S. The fourth link has a testimonial of someone who beat melanoma using natural methods. Reassure your Dad that cancer positively CAN be overcome! I'm sure your encouragement for him to keep fighting will help his chances of beating this.