I think leading by example is always a great way to help those around you think about their own habits and realize they to can make changes easily. I'm not a huge meat eater in general (I don't crave it like some people), but I find that I eat it because it's just always around (BBQs, etc.) This goal allows me to stop and think before I eat and realize that often I don't really even want the animal products that are readily available. Shifting my habit to meat once per day (or not at all) has easily rubbed off on my partner (who can't live without meat), and has created opportunity for conversation with my parents. People might not always follow suit, but at least you had the opportunity to explain why eating less meat or no meat is important. Maybe they'll skip bacon next time they're ordering, you never know!