To be honest, I’m not particularly a fan of the Rookie Ready to Learn series in general:  I find the activities in the back of each are often formulaic and only tenuously related to the story; each one ends by telling you someone’s version of what you just learned by reading this story (besides being patronizing, they often don’t hit the mark).  But if you do like this kind of thing, or you’re willing to ignore the extra features that don’t enhance them, the central stories are often good little stories, with redeeming qualities of their own.  This one uses simple rhyming text, supported by the illustrations, to list all the things a big brother doesn’t want to do, but he does, so that he can set a good example for his baby sister.  It’s a cute book, helpful as a tool for emergent readers.