I think that the best way to convert people (OK, I admit, I haven't tried this yet but I'm pretty sure it would work) is to find subtly deceptive and nefarious ways of getting people to read Why Vegan? (Available for free from www.whyvegan.org.
) If you're Mom is like, "(Your name here), what you're doing is fanatical and crazy and it's really hard for me to make you meals and it doesn't make any sense... etc...." just say, "Well you have no right to insult my beliefs until you understand them. Either accept what I'm doing or understand it." And then you show her your always-on-hand copy of Why Vegan? (a must have.) Also, when omnis ask you why you're veg*n that's your chance to explain to them, don't hold back! If they say "I really didn't want to know/hear all that" then just say, "Well, you asked!" This works even better if they're persistent. Hand them your copy of why vegan and they might not only understand, but convert. Also, you should memorize some of the facts from the book off hand so that you can defend yourself on the spot. For example, when I went down to breakfast this morning my brother asked me if I would force my kids to be vegan. I said yes. He said, "But a vegan diet isn't healthy for babies!" And I said, "Well, are you an expert on the subject? According to the American Dietetic Association's 1997 position paper on vegetarian diets, 'Well-planned vegan and lacto-ovo-vegetarian diets are appropriate for all stages of the life cycle, including during pregnancy and lactation.'" If you argue with someone long enough, it really just boils down to the fact that veg*nism is morally correct and if you're not a vegetarian it's because you're uninformed, misinformed, lazy or selfish. I made my brother watch "Meet Your Meat" a while back and he chose lazy. My friend says he's seen those kind of things but he's just selfish. My parents don't want to read Why Vegan? because of the gruesomeness of it so they are uninformed.
I think the point I'm trying to make is that we should always have a copy of Why Vegan? close by and we should try to be more aggressive missionaries.