Well, without more context, it's difficult to say precisely. It might be a story about two twins who had very different personalities. One, the 'bad' twin, could have engaged in immoral or unethical behavior. This could range from lying and cheating in personal relationships to getting involved in more serious things like theft or fraud. It could also be a story told from the perspective of the other twin, trying to come to terms with having a sibling with such a negative disposition.
Since I don't know the exact story, I can't share the key events. But generally, in a 'bad twin' story, there could be an event where the bad twin first shows their negative side, like stealing something precious from the family or lying to get the other twin in trouble.
Twin Sanity is purely imaginative. It's not drawn from real-life happenings. The story and characters are crafted from the author's creativity rather than real experiences.
Yes, 'Twin Peaks' is inspired by a true story. The show creator David Lynch was influenced by various real - life events and locations. For example, the small - town setting and the sense of mystery in real - life small communities might have contributed to the creation of the fictional town of Twin Peaks.