Strange I've not come across such cases which actually get to court.

I'm not denying though that such situations do arise - one I am familiar with is a young lad in a care home who was accused of sexual assault by another boy - it meant nearly 18 months of police bail before the CPS decided that there was insufficient evidence and that is where the problem lies in my opinion - there was absolutely no excuse for such a lengthy delay and the terms of the police bail were Draconian.

In your scenario I simply do not believe that such a case would ever get to court - there would have to be more evidence for it to do so - the first and most obvious would be evidence from the children, then from health workers and social workers.