TASK DEFINITION: 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.
PROBLEM: Sentence1: John did not know how to roller skate. Sentence2: His friend said that he would teach him. Sentence3: They spent all day practicing skating. Sentence4: John kept trying and got very good. Sentence5: Now he roller skates all over the neighborhood.

SOLUTION: John, Friend

PROBLEM: Sentence1: Tony decided to make lemonade the old-fashioned way. Sentence2: He brought out some lemons, water, and sugar. Sentence3: He squeezed the lemons until he thought his hands would fall off. Sentence4: He then added some water, and a generous amount of sugar. Sentence5: Tony tasted his lemonade and decided he wanted to be a chef someday.

SOLUTION: Tony

PROBLEM: Sentence1: Tina was visiting her family's home at the ocean. Sentence2: When she arrived, she remembered how scary it was when she was a kid. Sentence3: After staying at the house for a while, Tina could not stop fearing. Sentence4: She eventually told her parents that she was too scared to stay. Sentence5: Tina drove home from the vacation house in fear.

SOLUTION:
Her family, Her parents, Tina