Detailed Instructions: In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Problem:Sentence1: I played tetherball one time with my brother. Sentence2: It was a lot of fun swatting the ball back and forth. Sentence3: But it got a bit too competitive. Sentence4: On one of his hits, the ball struck me in my face. Sentence5: Man did that hurt and it taught me a lesson to be careful.
Solution:
I (myself), Brother