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: Bailey was having her birthday party. Sentence2: Her best friend wasn't able to attend. Sentence3: The next week her friend invited her over. Sentence4: Her friend's mother had baked her a cake. Sentence5: They gave Bailey her birthday gift.
Bailey, Best friend, Best friend's mother