Hi I'm sorry to hear about your uncle and I hope your Dad is ok. Has he been to see a consultant ant and get a scan and see what they recommend? I know if there's cancer in the stomach it's very inflamed and he should eat foods that are easy to digest like vegetable soups and you can get a juicer and do green vegetable juices. It would help him to avoid foods that are hard to digest like meat and cows milk and also get the sugar out of his diet even fruit juice and high sugar fruits like grapes and bananas. My friends brother had stomach cancer and a nutritionist told us this. He also said to take supergreens powder containing wheatgrass. If your dad has high blood sugar, you need to get this down and any excess weight he carries round his middle. I wish you the very best.xx