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BBC!EMPT Sherlock addresses Mycroft as Blud. Meaning brother -
Wiener Blut ('Viennese Blood) is a wedding waltz by Strauss, of 1873. A version of which was played in Sherlock Holmes: Game of Shadows when Dr. John Watson and Madam Simza find her brother at a peace summit held at Switzerland.
Switzerland, The Reichenbach Falls, was the original site where Holmes 'died'.
And finally a waltz composed by Sherlock was played by him for Dr. John & Mrs Watson's first wedding dance.
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interesting, but seriously I don't think they meant to make such a connection...
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The connection is that Blut means blood, in both dialects. The reason is that they are both Germanic languages, the words have a common ancestor, they're even pronounced more or less the same.