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: Ella needed a new crib. Sentence2: Her son broke the last crib. Sentence3: Ella then went shopping with her husband for one. Sentence4: Finally the they found one they liked. Sentence5: They immediately purchased it.
Ella, Ella's husband, Ella's son