Hi @zyrawr I'm so sorry to hear about your father. I lost my dad to a very aggressive cancer, and my mom battled against breast cancer a couple of years later so I became very interested in this topic. I've read a lot about natural cancer cures and thought I'd mention a few things you may want to add to the mix. One is compound called Laetrile and its found in apricot kernals (the inside of apricot stones) apples seeds among other things. It suppose to actually kill cancer cells but I have no direct experience with it. You'd have to do a good amount of research of course but here is one link:

I think a positive attitude, connecting with nature, yoga, emotional healing combined with nutrition are important. A real holistic approach is needed (just my opinion). I hope he pulls through! I wish you both all the best.