Teaching my son to be a man of his word

My dad taught me that a handshake is your bond. You don't need contracts or lawyers if you're a man of integrity. I'm trying to instill this in my boy, now 16. He made a commitment to his grandmother that he'd help her with yard work every Saturday. One Saturday he wanted to bail to hang with friends. We had a talk about what it means to be someone people can count on. Told him that being a real man means doing what you say you're going to do, especially for family. He went and helped his grandmother. That's the kind of man I want him to become.