Detailed Instructions: 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: Marcus wanted to give his Mom a great birthday gift. Sentence2: He just couldn't figure out what to give her. Sentence3: He called his sister for suggestions. Sentence4: His sister overheard their mom gawking over a vacation spot. Sentence5: Marcus decided to get that for his mom and she was thrilled.
Solution:
Marcus, Sister, Mom