The Berenstain Bears and the Baby Chipmunk is relatively recent book (2005) featuring all three children (Brother, Sister, and Honey). In this story, Sister discovers a baby chipmunk sitting all alone in front of a tree. Once the family decides that the chipmunk is without a mother, the family adopts him. Naturally, creatures of the wild often get into mischief once brought indoors. Though it's clear that the chipmunk would probably not have survived but for the Bears' nurturing, soon it's time to let him run wild. Fortunately, however, the chipmunk's natural home appears to be the Bears' backyard. Thus, the family can see him playing with his friends every day.
This story is one of the only ones I've read that wasn't written in rhyme. Though longer than most of the Berenstain books I've reviewed, the degree of difficultly seems firmly in the grades 2-3 range, if not younger. It's an enjoyable story, particularly with all the cute chipmunk antics, but won't be making my favorites list.
Source: Library Book