So there is a little bit of copy-cat going on here, which is really pretty cute and hopefully works in our favor. In a few years they'll be doing the dishes alone right? B is in what I call (however unscientific etc. that it might be) the pre-reading stages, where she just pretends to read the story and is thrilled that she read the whole book. She's even more thrilled if she has someone patient enough to be read to.