If you do something as extreme as taking your whole family off of dairy
products, you'll have to work quite diligently to see that they get their
required calcium. Virtually no foods are rich enough in calcium that they
can be consumed in sufficient amounts to satisfy a growing child's need for
calcium. You'll have to find a good, milk-free supplement.
My dairy-allergic son is now taking several calcium pills per day, and his
growth has improved significantly. Unfortunately, you can't see immediate
effects of poor calcium - you just have to take on faith that they need it.
Mark Feblowitz