I am going ONLY on the question, not any real incidents. A nine year old should be punished for attempted murder just like anyone else, though the punishment should be a little different. First of all, if the parents are decent people, they should keep custody of the child, but not posses any weapons or poisons, and should keep a close eye on the child. Many kids think about murdering their parents, but few try. This really isn't abnormal. There is a child, and two people who try to rule his/her life, there's bound to be unpleasant desires.
AFAIK, the police officers who charged the family(with the baby therein) are suspended for further investigations. Obama is too busy at the moment and wouls get back to you at a later time. Currently, our concatenation relies on drones, coercive rhetoric and sanctions, certainly pathetic and sad IMO. This is how we roll in relations with some other countries however.