Is your father a smoker? If he's never smoked then it would definitely be better for him to try an edible (such as a brownie) first. I started using medical mj for migraines a few months ago and had a real hard time learning to smoke - and if he's feeling nauseous it's going to be the last thing he'll want to try. So yes - try a brownie. It will take a good hour or two for it to kick in but he should feel full body relief and gain some appetite!