Thanks for biting. I wonder what is in the COUNTS that we do not have. I wonder if the GJ determined that one, or both, of the parents were the murderer(s), but unable to determine which, indicted both. I have seen this happen to two men who beat one of their wives to death but no one could determine which one struck the blows. Both were charged and convicted of murder. It is possible that one of the COUNTS was Murder in the First Degree, isn't it?
Without being able to read all the counts I can only guess that they covered for Burke and knew that he was a danger to his sister but failed to heed warnings.
Then I want to know who warned them that Burke was a danger to his sister? It seems that the GJ must have had some evidence of a warning in order to 'True Bill" Count IV.
Who would be able to testify that Burke posed a risk of bodily harm and even death to his sister?