by Judy Blume (1972)
Another favorite from my youth, and if you knew my brother and/or sister* you understand how often I exclaimed "I feel your pain, Peter!"
Nothing deep, just good entertainment, especially for for those students with younger siblings. I found little Fudge (and Mom) more annoying than endearing, but definitely respect Peter's resiliency.
Love Blume's website, lots of personal insights on story origins and comments on censorship.
*this may read as if my brother became my sister, but I have one of each and my brother has, as far as I know, remained very manly.