Rumor was that they’re Irish children, which is illegal, and done thru a South American agency. That was on multiple sites last year, plus reprinted here on FR.
http://underneaththeirrobes.blogs.com/main/2005/08/the_roberts_ado.html
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http://www.freerepublic.com/focus/f-bloggers/2906761/posts
I had forgotten Irish...was thinking Russian...
I do remember that the story was not one that he could tell.