My son is somewhere halfway on the road from omni to vegetarian. Unfortunatelly my mom is not supporting us at all, and she buys for him especially the meat foods that she knows he won't say no to.
Also, they're teaching kids in school that a well balanced diet contains meat products. He came back from school a couple of weeks ago with a booklet that he made (coloring and fiiling in blanks) about the animals that live on farms. Well, there was a... strange sentence in there: " We love pigs becouse they give us meat". I couldn't take no more and I wrote a note to his teacher: how could they teach the kids to love an animal for the sole purpose of eating its flesh???? And... how can you lie them in the face by telling that pigs GIVE meat??? They don't just give it for free, smilling and waiving at us, they ar KILLED for it!
Anyways... our son knows why we do not eat meat (health, environment, animal rights, etc), and he agrees with us. He sometimes tells us :" I know it's sad, but ...". He'll make his own mind eventually, and we do not want to force him. We prefer him to come to this by himself, instead of being pushed and, sometime in the future, becoming a meat eater on purpose just to prove us someting. (especially when my mom'd been a vegan for about 7 years and then she came back to meat eating saying that veganism was just...a phase).