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: My mother has an old game system. Sentence2: She played it very rarely. Sentence3: I asked her if I could play it. Sentence4: She told me that it was too old for me to play. Sentence5: I played it anyways.
I (myself), Mother