I adore Auggie’s answers – which pretty much parallel my own thoughts.
1. Exposing kids to other cultures/languages/beliefs/philosophies and demonstrating tolerance.
2. Making clear what you expect of kids – simple boundaries/consequences.
(In our experience, the more this was covered when the kids were very little the less we had to say as they got older. It’s now very simple to say to our preteen or teen aged kids: “Wow, that’s just not OK.” and they are instantly contrite, apologetic and fix the behavior.)
3. Constant humor. We laugh at ourselves, each other and all have pretty snarky humor. It works well for all of us…or at least we’ve warped our kids in a way that’s entertaining for us…