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: George found a baby squirrel while out on a walk in his neighborhood. Sentence2: It did not appear to have a mother nearby at all. Sentence3: George decided to take the baby squirrel home and take care of it. Sentence4: He named the squirrel Rocky and raised it to be his pet. Sentence5: Rocky was George's faithful friend for many years after that.
Mother, George, Squirrel