Whose fault is it?

I have to tell a cute story: The other day we were sitting in the living room reading books when Kayla chose a book that had a page that had been torn. She points at it and goes "Oh, Oh, broken". I said "Yes, someone tore the page. Did you do it?". She then says "NO, Bubby do it". A little later Jordan had the book and also pointed at the page saying "Oh, Oh". I then asked him the same question and he says "Nana do it". Well, Kayla was in the background and heard Jordan try to tattle on her. She looks at me and comes running in and pointing at the page she yells "BUBBY DO IT". (clearly she didn't rip the page). I can't believe that they are only 2 and already starting to blame each other :) We are in for some fun times!!!