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: Dave's parents have a restaurant. Sentence2: They want him to take over the family business. Sentence3: He did not want to. Sentence4: He finally told them how he felt. Sentence5: They decided to close the business.
Dave, Dave's parents