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Dr Julius Hibbert is the Simpsons family doctor.
Dr. Julius M. Hibbert (The Simpsons' family doctor)(voiced by Harry Shearer) & Dr. Nick Riviera (voiced by Hank Azaria)
Evidently, Dr. Julius Hibbert is Murphy's long lost brother.
It would also seem Murphy has another brother who is Hibbert's twin, who is the director of the Shelbyville orphanage.
Toots Hibbert's birth name is Frederick Hibbert.
Toots Hibbert goes by Frederick 'Toots' Hibbert.