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: Samuel would eat almost anything. Sentence2: He just couldn't stomach fish. Sentence3: His parents would always make him try it though. Sentence4: This time they forced salmon down his throat. Sentence5: Before he could swallow he had already started throwing up.
Samuel, Parents