Sophie gets angry with her brother because he revealed her secret to Jansie's brother. This incident causes Sophie to feel betrayed and violated, leading to her anger towards her brother. Here's a detailed explanation:

Background:
Sophie and her brother have a sibling relationship, which is typically characterized by love, trust, and support. However, in this particular situation, Sophie's brother does something that goes against the principles of trust and confidentiality, leading to her anger.

Explanation:
1. Revealing a secret: Sophie's brother reveals her secret to Jansie's brother, which is a breach of trust. Secrets are usually meant to be kept confidential, and sharing them without consent can be considered a betrayal.
2. Violation of privacy: By revealing Sophie's secret, her brother violates her privacy. Sophie may have trusted her brother with this information, and the fact that he shared it without her permission can make her feel exposed and vulnerable.
3. Lack of consideration: Sophie's brother's actions demonstrate a lack of consideration for her feelings and well-being. He prioritizes sharing the secret over maintaining Sophie's trust and respecting her boundaries.
4. Sense of betrayal: Sophie may feel betrayed by her brother's actions. Betrayal can evoke strong emotions, including anger, hurt, and disappointment. Sophie trusted her brother to keep her secret, and his decision to share it undermines that trust.
5. Emotional response: Anger is a common emotional response to feelings of betrayal and violation. Sophie's anger towards her brother may be a result of her feeling hurt, disrespected, and let down by someone she expected to support and protect her.

In conclusion, Sophie gets angry with her brother because he revealed her secret to Jansie's brother, causing her to feel betrayed, violated, and hurt. Trust and confidentiality are important aspects of any relationship, and when these principles are compromised, it can lead to anger and a breakdown of trust.