The protagonist of the story is the main character or hero, and the antagonist is the opposing force (sometimes referred to as the villain). Assuming that you are speaking of "The Split Cherry Tree" by Jesse Stuart, the protagonist would be the Narrator (Dave), and the antagonist would be his Father. As the audience, we can see that Dave is afraid of his father, who is a violent man. Dave fears the anger of his father, the beatings that he (Dave) recieves when his father is displeased, and the possibility of his father pulling a gun on the teacher.