To answer your question about what to do now...

As long as they don't have any amalgams, a careful detox plan would probably benefit them greatly, especially if the culprit is mercury.

I, like those previous in this thread, highly recommend the Cutler book to help you check out each symptom and educate yourself about how to deal with it.

A good plan that would apply to anyone would be:

Vitamin E and Selenium ( suggestion )
Vitamin C with Bioflavonoids ( suggestion )
Algin ( suggestion )

These will help protect them from further damage. When you put together a detox plan, you can add in things that fit their symptoms. If you want to list some of the symptoms here, I can let you know what is commonly used.

Hope this helps.