M.C.
Congrats on feeding your family healthy! Aside from what has already been said, I have two general rules:
1) Read the ingredient label. If you can't pronounce it, you shouldn't eat it.
2) (which is not so different from 1) Food should be readily recognizable as food--it should be visually obvious how it came into the world, whether via plant or animal (although we're almost entirely vegetarian at my house).
For snacks, my DD gets a lot of fruit and raw nuts. Luckily, she loves veggies (has never really had anything different). Veggies in the crockpot work great for little ones, since they're nice and soft. She doesn't drink juice, she does drink milk (I've heard convincing arguments both ways on this, but she loves it), but she also drinks lots of water--which we all should!
Make stuff yourself--premade stuff is usually junk--but keep it simple. Chopped tomotoes with herbs taste great on pasta...lentils simmered with onions and balsamic are a hit at our house... For more ambitious days, we're a big fan of the cookbook "The Healthy Hedonist." GL!