I would say you can. But it's difficult. I took a veggie kid to a birthday party, and they raided the cocktail sausages until they were in pain.
But as parents, it is a parent's job to raise their kids healthily and well. And I can see veganism being a big part of that.
Omnivores, veggies, vegans whatever can have dreadful or great diets. And it is a science that is completely unresearched and undiscovered and understood.
Calcium can be had a ground seeds very easily. It can be hidden in food, or used as a sprinkling.
You couldn't buy junk vegan food that easily a decade back, or if you could you would bankrupt yourself. So were forced into a varied diet, watching what you ate.
I know people that live on pot noodles and cigarettes. That never eat vegetables. Or hardly any at all. And veggies that just eat cheese every thing and anything.
Just try to get a varied diet. Avoid white flours, pastas and rice and instead use whole grains. You get used to what you eat in time. And can trick any old palette really. I have found kids can gravitate to healthy foods just as much as they can sweets etc. I think veganism actually widens your horizons hugely with food options.