BND - I know you've said they tested your D for celiac disease before, but I'm still really suspicious. The tests aren't perfect. Having another young child being considered for Crohn's disease (which can often be associated with gluten sensitivity as well)......the odds would seem to favor the simplest explanation, which is that they're both gluten sensitive or have celiac disease. (It runs in families).
Check out http://www.celiac.com. Be aware that 50% of celiac patients are also casein (dairy) sensitive when they're first diagnosed.
