Considering the situation described above, my brother needs to work on Self-Monitoring.
This is because Self-Monitoring is a term often used in sociology to describe the ability to is a personality trait that involves monitoring and regulating personal presentations, emotions, and attitudes towards his social environments and situations.
By mastering the habit of Self-Monitoring, my brother would be aware of his words, behaviors, and emotions towards its effects on the people around him.
Hence, in this case, it is concluded that the correct answer is "Self-Monitoring."
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