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: There was a sliding glass door at Grace's house. Sentence2: Grace ran into the glass door and cut her knee. Sentence3: Her frantic mother took Grace to the emergency room. Sentence4: Grace needed ten stitches in her knee. Sentence5: Her mother decided to put butterfly stickers on the glass door.
Mother, Grace