The past perfect is optional here. The "stop at his aunt's house" occurs before the arrival at his house. If you are going to use the past perfect, this is a good place because of the contrast of two completed events, one occurring before the other.
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AnonymousPlease tell me the past perfect tense is correctly usedNot really. It's not necessary. The past perfect is used more for those occasions when you are telling a story in a different order from the order in which it occurred. Here is a typical use, where the last sentence tells something that happened earlier in the story: