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In His Last Vow, Mycroft is questioned about his feelings for Sherlock and he says

"Don't be absurd. I'm not given to outbursts of brotherly compassion. You know what happened to the other one."

Is there a 3rd Holmes brother in any canon?

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I hope he doesn't mean Moriarty... no, wait, Mother Holmes is a mathematician, that must be a hint that SHE is the real Moriarty... no, they wouldn't that... –  Oliver_C Jan 13 at 13:30
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is it possible that the return of Moriaty is linked to this elusive '3rd brother'. i am aware of sherrinford but the series likes to have its' own spin off. –  guess who Jan 13 at 21:46
    
ofcourse Moriarity has to be back because Charles Augustus Magnussen sucked!! –  Dredd Jan 15 at 3:20
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3 Answers

There is mention of another brother Sherrinford Holmes on wikipedia:

Sherrinford Holmes is a hypothetical elder brother of Sherlock Holmes and Mycroft Holmes. It is believed that his deduction skills exceed those of both his younger brothers. His name is taken from early notes as one of those considered by Arthur Conan Doyle for his detective hero before settling on "Sherlock Holmes".

He was first proposed by William S. Baring-Gould who wrote in his famous 'biography' "Sherlock Holmes of Baker Street" that Sherrinford was the eldest 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 were the eldest then he couldn't play the role he does in four stories of the Sherlock Holmes canon, so Sherrinford frees them both. This position is strengthened by the fact that Mycroft's general position as a senior civil servant was a common choice among the younger sons of the gentry.

The character appears (misspelled Sherringford), along with his brothers, in the Virgin New Adventures Doctor Who novel All-Consuming Fire by Andy Lane, where he is revealed to be the member of a cult worshipping an alien telepathic slug that is mutating him and his followers into an insect-like form; the novel culminates with Holmes being forced to shoot his brother to save Watson.

He also appears, accused of a murder that Sherlock must find him innocent of, in the Call of Cthulhu roleplaying game adventure The Yorkshire Horrors.

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Please credit sources when doing a cut and paste. –  Paulster2 Jan 13 at 12:26
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No, there is no third sibling in canon.

In literature, Sherlock's only sibling is his brother Mycroft. From the Baker Street Wiki:

Mycroft Holmes appeared or is mentioned in the following adventures:

"The Adventure of the Greek Interpreter"
"The Final Problem"
"The Adventure of the Empty House" (mentioned)
"The Adventure of the Bruce-Partington Plans"

Sherlockian also discussed this, commenting:

The rest of the family

It is natural to wonder whether there were other brothers in the Holmes family. None are mentioned in any of the original Sherlock Holmes tales. But the 1975 film "The Adventure of Sherlock Holmes' Smarter Brother", starring Gene Wilder, is not about Mycroft; instead, Wilder presents a manic third brother, Sigi Holmes. Presumably the name is short for Sigerson, taken from the alias used by Holmes in "The Empty House".

A number of Sherlockians have ventured to speculate about a brother named Sherrinford. That name is taken from Arthur Conan Doyle's original notes for A Study in Scarlet, in which the name Sherrinford is used for the consulting detective who would shortly appear in print under the name of Sherlock.

And what about sisters? There is no evidence, apart from a few wistful comments in "The Copper Beeches" to the effect that "no sister of mine" should run the risk that faced Violet Hunter.

From this, it can be clearly seen that there is no third brother in canon.

That doesn't mean a third brother won't appear in the show. From many interviews with Steven Moffat:

When we asked how the briefly mentioned third Holmes brother may eventually play into the series, Moffat, not surprisingly, teased that we should just, "Wait and see!"

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Wiggins is the third brother. That's already been confirmed. He clearly has the powers of deduction to match either Sherlock or Mycroft and he mentioned inheriting all of Sherlock's stuff if he dies. Obviously he is alluding to the fact that he is a close relative.

We know that Holmes brothers are masters of disguise and Wiggins proved that by being so close to both of his siblings without being discovered.

The only question now is: Who's side is he on?.....

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"That's already been confirmed." No. That is not confirmation. While it may be the case, confirmation requires proof. You are theorizing. A true answer is verifiable with evidence and preferably cited proof. Besides, his deduction did not match Sherlock's because he was wrong about John's chaffing. The "obvious" fact that he mentioned inheriting Sherlock's stuff was because he called himself a protégé. This is not to say you are wrong, just your execution of an answer is wrong. –  Meat Trademark Jan 15 at 4:04
    
Well i don't think wiggins is his brother when he introduces him to the family. Mycroft sarcastically remarks that its amusing when sherlock brings his friends over. –  Dredd Jan 15 at 14:26
    
If he was the 3rd brother, then Mrs. Holmes would not have wondered why he was there. –  Leatherwing Feb 3 at 23:33
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protected by iandotkelly Jan 15 at 2:51

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