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.
Q: Sentence1: Colin worked as an on-call electrician. Sentence2: He was called in to help rewire a house for a small family. Sentence3: Collin was very kind to the family while he worked on their house. Sentence4: The children of the family had the idea to make Collin a treat. Sentence5: On his last day of work, Collin received a batch of fresh cookies.
A:
Colin, Children, Family