Well ... I suppose it's possible that their kid had severe eating disorders, and that they subsequently adopted three more kids who also had the same sorts of eating disorders.
I'm inclined to believe that there's real abuse here. But some of the other stuff is odd -- maybe there's more to it.
The church thing is really strange. Sounds like some of those folks are going out on a limb for these people, so maybe they know something we don't.
They could have been fooled by the Jacksons, who'd have honed their skills on the social services people.