Z: ahhh! Ahhh!!
E (my little tattler): "Mommy!! H is hitting him!!"
Z (indignant): "No!! I'm hitting her!!!"
E: "Mommy! Z is hitting her!!"
... to which mommy says nothing and pretends she didn't hear for fear of three small children running to her and crying.... oh good, it worked! they are all happy again.