Lacy says she "hates" her little brother because he gets all the attention and causes all the trouble. Lacy's response is consistent with the basic idea behind the development of:

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Lacy's response is consistent with the concept of sibling rivalry, which is a common phenomenon wherein children compete for the attention, affection, and resources of their parents. This competition can lead to negative feelings such as jealousy, resentment, and hostility towards one's siblings. In Lacy's case, her negative feelings towards her brother indicate that she perceives him as a threat to her relationship with her parents. Her statement that he "gets all the attention and causes all the trouble" suggests that she feels neglected and overlooked in favor of her brother.

Lacy Says She "Hates" Her Little Brother Because He Gets