The answer to the question regarding Sherlock Holmes brother is letter C or Mycroft. He is seven years older than Sherlock Holmes and is considered more knowledgeable than Sherlock Holmes. However, he doesn’t really practice his knowledge because he disliked fieldwork and has a poor physique.
He was created by Sir Arthur Conan Doyle and he first appeared on The Adventure of the Greek Interpreter – the 10th book in The Memoirs of Sherlock Holmes published in 1893. Sherlock Holmes said the following about his brother: “…he has no ambition and no energy. He will not even go out of his way to verify his own solutions, and would rather be considered wrong than take the trouble to prove himself right.”