you can raise vegan kids....lots of indian folks do it all the time. ug. i am a meat eater but i think you should include protein in the form of dairy, eggs, cheese, beans. these folks were just plain abusive if they had skinny kids.
not just vegans too but i used to have an acquaintance who was a zealous athlete and a NO FAT freak. i can remember her 9 year old daughter coming home late at night from gymnastics and she would give her plain pasta to eat. plain.
There's a very strict Hindu sect that is pure vegan -- has been for many centuries, and survived and reproduced just fine. Some of them moved to England, where they all got seriously ill after a few years, supposedly living on the same diet.
Turns out that the grain in England is a lot cleaner than the grain in India. The "vegans" in India were getting a substantial dose of vitamin B12 and essential fatty acids from the INSECTS that contaminated the grain they were eating.
When they started eating clean English grain, they became true vegans for the first time! After several years on that diet, their bodies slowly ran out of stored nutrients, and deficiency symptoms began.