On these threads, I love how someone always claims that vegan diets for children will make it impossible for them to ever to be able to digest meat, while others insist that children brought up vegan will inevitably become passionate meat eaters in order to rebel.
Don't these prophecies conflict a bit? They can't both be true, can they?
Or, perhaps, just perhaps, we're all individuals, bringing up our own individual families in our own individual way, and it works out differently for all of us.
Let's consider smoking, as an analogy. Meat is not a tobacco, but it is something that many people hold strong views on. When I was growing up, most parents told their children not to try cigarettes, in their own individual way. Sometimes, for whatever combination of reasons, it didn't work and their teens rebelled and did take up smoking, and in other families, for whatever combination of reasons, their teens listened and refused to try cigarettes.
I wouldn't give up on telling my teens not to smoke just because Mrs Smith's son down the road rebelled in a big way when she told the same, so why should the OP assume that it is inevitable that her children will choose to eat meat?