The narrator discovered that his brother and his school clan were skipping online classes to play games. He decided to troll them by revealing their falsified grades. The narrator and his brother's clan reacted to their real grades, which showed that some of them had failed or were underperforming. The narrator then challenged his brother's clan to a game, which he won. As a result, he called the parents of the children in the clan to inform them about their kids' poor performance and misbehavior. The parents were told to come to their house to discuss the issue.
Here are the key facts extracted from the text:
1. The speaker's brother and his friends were skipping online classes to play games.
2. The speaker discovered that his brother's friends had falsified their school grades.
3. The speaker decided to react to the grades and reveal the truth.
4. The speaker's brother's friends had taken various subjects, including mathematics, Spanish, social sciences, physics, and chemistry.
5. The speaker's brother's friend, Sergio, had a grade of 7 in mathematics and a grade of 18 in another subject.
6. Another friend, Bald, had a grade of 5 in social sciences and a grade of 6 in Spanish.
7. The speaker threatened to call the parents of his brother's friends if they didn't reveal the truth about their grades.
8. The speaker's brother's friends played a game, and the speaker won.
9. The speaker called the parents of his brother's friends to inform them about their children's grades and behavior.
10. The parents of the children were coming to the speaker's house to discuss the issue.