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: Roger invited his brother to play a game of chess. Sentence2: His brother was reluctant, but eventually accepted. Sentence3: They set up the board between them. Sentence4: Roger easily defeated his brother in the game. Sentence5: He then realized why his brother had been so reluctant before.
His brother, Roger