Family dynamics play a big role in whether or not your family members will start to embrace a healthier diet. However, after a while, you shouldn't find it hard to say no to those foods. They simply stop being appealing. After all, this way of eating/living is one of freedom and comfort, not one of discipline and abstinence. In the beginning, though, there is a certain recovery from sugar addiction (including glucose from grains) that can be hard to overcome.
If you're hungry, eat. If you're not, don't. Either way, NEVER feel guilty about it.