Depending on how advanced it is, hard to know if anything will help, but half tsp of baking soda every day will balance the body's pH level. You want to stay alkaline. No acidic foods and especially no sugar. Cancer thrives on sugar. Eat organic foods, vegetables and meats. Mostly wild fish is good. I'm sorry about your father in law. I can tell how much he means to you. I'll be praying for him and you too. You never know, you may have him for a very long time.