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: Anna's parents took in a foster son. Sentence2: At first Anna was jealous. Sentence3: She did not want a brother stealing her mom's attention! Sentence4: But soon she grew to like the little boy. Sentence5: She was happy when her parents officially adopted him.
Solution:
The foster son, Anna