The standard American diet was created for taste not for health. So eat what tastes good. Also how many foods did you give up maybe beef (cow and dairy), pig, turkey, chicken (and eggs) and maybe sheep. Vegans can eat caffeine, sugar and soda but they are very unhealthy.
Fruits are very nutritious so just find the ones that your kids like. The Mac was named after the most popular apple. There are also bananas, dates, figs, grapes, raisins, kiwi, pineapple, papaya, plums, pears, oranges, avocados for healthy fat, watermelon and other melon, lots of different berries (like goji berries) and lots more. Then there are lots of vegetables. Hard fruit (nuts and seeds) are a good source of protein and fat.
Beans are a good source of protein and nutrients (includes tofu). A few whole grains are good like oats, barley, millet, brown rice, kamut, wild rice and others. Fungus is good for the immune system. Mushrooms are fungus. There are healthy granola type cereals with no meat in them. Then you can add soy, hemp, rice, almond or coconut milk.
Keep in mind that none of the animals that people eat, eat meat. People only eat animals that are plant eaters. So when people eat meat, they are getting the plant food second hand. Cows eat grass or grains. You can eat flaxseeds (flaxseed oil also) or chia seeds for omega-3 fatty acids that vegans need. You can supplement vitamin B-12 and vitamin D (sunlight is the best source). Those are the 3 things that many Americans have a shortage of.
I have a friend that eats an almost all raw vegan diet and she just had a healthy baby boy. Not only vegan but 95% raw also. Here is her blog. http://www.rosegoddessbliss.com
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