Herein, is Moriarty the brother of Sherlock?
No. Mycroft Holmes is. Moriarty is the character who (spoiler alert) kills Sherlock Holmes in the Adventure of the Final Problem by Sir Arthur Conan Doyle.
Also, what mental illness does Moriarty have? antisocial personality disorder
Also to know is, do Sherlock and Mycroft have another brother?
In “The Lying Detective,” we got confirmation that Sherlock and Mycroft do have another sibling, a sister named Eurus (the very talented Siân Brooke). Eurus has been hiding in plain sight since the beginning of season 4.
What is the relationship between Sherlock and Mycroft?
The elder brother (by seven years) of detective Sherlock Holmes, he is a government official and a founding member of the Diogenes Club. Mycroft is described as having abilities of deduction and knowledge exceeding even those of his brother, though their practical use is limited by his dislike of fieldwork.
