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.
One example: Sentence1: My dog was bored. Sentence2: I was working all day so I couldn't spend time with him. Sentence3: When I finished work I decided to play with my dog. Sentence4: He was so happy to finally have some fun! Sentence5: Alas, he fell sick and died.
Solution is here: I (myself), Dog
Explanation: There is only two characters in given story, i.e., I (myself) and dog.

Now, solve this: Sentence1: Our family had a collection of Beanie Babies. Sentence2: A friend was supposed to sell a few of them at a yard sale. Sentence3: My brother in particular had several of them. Sentence4: One of his sold for twenty dollars! Sentence5: It must have cost about a dollar to make.
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Our family, My brother, Friend