1) The narrator is upset that they cannot bring their pet Fluffy on a family vacation and refuses to go.
2) The narrator's brother does research and finds a travel agency that can help prepare all the necessary documents to bring pets traveling. He presents this information confidently to their skeptical father.
3) Impressed by his son's persistence and preparation, the father decides to allow the pet to come after all. The narrator is thrilled that they can now bring Fluffy on the family trip.