Fifth, probably one of the easiest, follow a religion, people who have a religion and more disciplined, they always obey some higher being, I would suggest Judaism or Muslim, they are the most disciplined, since your in Japan, Buddhism or Shinto would do. The risk is that your family might stray into radicalism and fundamentalism, which is why I suggest take moral lessons from different religions instead of blindly following it, that way it will take more effort and time but you will follow the moral guidelines and not believe in bull**** like a guy able to walk on water, or 72 virgins after death etc