Hi... Welcome to healthcare magic. According to your complain your father has problem of abdominal gas that may be because of lack amount of activity. Any food intolerance may lead to gas problem. Avoid stress . Avoid gaseous foods like cabbage cauliflower, turnips,carbonated drinks, broccoli....etc. Avoid too fatty foods and junk foods. Drink more water per day.. Do some walking also. Avoid immeadiate lying down after meal. Simethicone drug can use for gas relief. Use garlic and ginger in your food. Fruits like kiwi, avocado helpful. Consult a gastroenterologist for further diagnosis. Abdominal ultra sonography can done for further diagnosis. I hope my guidance helpful to you.. Take care. Thank you.