Raw food diet, juicing or green smoothies.  NO MEAT! Processed meat is full of nitrates that are cancer causing.  I've yet to hear of a vegan who got colon cancer although there probably are a few out there. Dairy is also not good.  Animal protein is like fertilizer for cancer!  Just dietary changes alone have reversed many a person's cancer.  I would also suggest a good quality probiotic to keep the entire digestive tract as healthy as possible and medicinal mushrooms.  Where does your FIL live? Different countries have different products so it's hard to make suggestions without this info.

I have a document full of proven cancer remedies.  Email me and I'll send it to you: detoxexpert@gmail.com.  Just remind me where I know you from please so I can send the right one.

Google "chemotherapy cures cancer and the world is flat". My protocol follow that line of thinking.  Without all three elements in place it's hard to cure anything:

-detox

-flood the body with plant-based nutrients

-healthy mind and attitude

I'd also add a fourth which is avoiding cell phones and radiation www.cellphoneguardian.com is what we use on our cell phones and I also wear the Personal Guardian.  The body remains acidic if exposed to radiation.  Cancer loves an acidic body!