Be sure you try all the veggies and fruits on your kids. My daughter loves kale and broccoli, any way shape and form, I can't keep the stuff around, it just disappears. She even takes it to school for snacks to share with the kids. I am the mom that has to bring the veggie platter to all the potlucks they have and she gets them all excited about it, talking it up days beforehand.
Avacado was a real lifesaver for us. My daughter will eat avacado (doesn't matter how it's prepared) when all else fails.
I also include her when preparing, whenever she helps with the prep, she is more willing to chow down. Even if all she does is wash her hands and sprinkle the salt on.