|Relationships|| Harcourt Grimesby (son)|
Mycroft Grimesby (son)
When Harcourt was about ten years old, Mycroft located the family. Mycroft murdered his brother and assumed his identity. He lived with his father for some time. Years later, Mycroft murdered his father by forcing him to drink cheap varnish.
Detective William Murdoch discovered the truth about the murder but Mycroft disappeared and did not pay for his crime.
In his later years, Grimesby had been having an affair with a neighbour's wife, Emmy Paulk.