Sherrinford Holmes
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Sherrinford Holmes is, depending on opinion, either the elder brother of Sherlock Holmes and Mycroft Holmes or an early idea for the name of the character that would later become known as Sherlock Holmes.
William S. Baring-Gould wrote in his famous 'biography' of Holmes that he was the elder brother of Sherlock Holmes. Holmes once stated that his family were country squires, which means that the eldest brother would have to stay to manage the house. If Mycroft was the eldest then he couldn't play the role he does in four of Sherlock Holmes canon, so Sherrinford frees them both.
Sherrinford Holmes isn't mentioned in any of Conan Doyle's writings, but by drawing inference from the novels he is created. His only mention is in some early notes belonging to Arthur Conan Doyle.