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: John hated spinach as a child. Sentence2: John's daughter refused to eat spinach. Sentence3: John ate spinach in front of his daughter. Sentence4: His daughter ate it after he did. Sentence5: John eats spinach for his daughter's sake.
John, John's daughter

Sentence1: On Thanksgiving morning the Smith girls were getting ready to cook. Sentence2: Everything was prepped and ready to cook, but something was missing. Sentence3: There was no cranberry sauce! Sentence4: The girls tried using other fruits to substitute, but none would do. Sentence5: Then Grandma Smith arrived with her world famous cranberry sauce!
Grandma, Grandma smith, Smith girls

Sentence1: Cathy needed to get some blood drawn for the lab. Sentence2: However, Cathy's nurse had trouble locating her vein. Sentence3: Cathy's nurse tried everything, until she finally gave up. Sentence4: Cathy's nurse decided to call her doctor to try. Sentence5: Luckily, Cathy's doctor was able to locate a vein and get the blood.
Cathy, Cathy's nurse, Cathy's doctor