Might be worth actually nutritionally analyzing you & your kids diets before stating they are getting the required amount of protein (which you need to grow strong - not tall - strong) & iron & look at the amount of carbs you & they eat.
I had quite a shock at how difficult this is - think for my height & weight I need at least 55g protein a day. The average vegetarian meal packs less than 10 g. Not filling, not nutritious.
The only vegans I know look ill - terrible hair, skin & look older than they are. My strictly veggie friend has rotting teeth, prematurely lined skin & terrible hair. Her finger nails split, as do the sides of her mouth. Other veggie friends are always watching their weight because they are always hungry because carbs just distrupt your blood sugar.
Yes, of course 'everybody knows someone', but go into any diets being informed.
FWIW the inuits eat mainly meat supplemented with berries. Their diet is high in omega oils & they do well on it. Year long studies on 2 men eating meat exclusively for a year showed NO vitamin deficiencies.
My vegetarian diet has seen me anemic, vitamin B12, folate & vitamin D deficient.
Bring on the liver & the bone soup.