Given the task definition and input, reply with output. 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.

Sentence1: Jason loved motorcycles. Sentence2: His mother bought him one for his eighteenth birthday. Sentence3: His sister said he rode it all the time. Sentence4: One day he had an accident. Sentence5: He crashed into a car and was badly hurt.
Sister, Jason, Mother