Sherlock, son of Sigerson?

      

Firstly I suppose I should say that the following is mere conjecture, though pretty thoroughly researched as far as it goes. But I don't actually believe a large part of it myself, having even more outlandish theories up my sleeve. I just can't resist starting a few hares.

I suppose the first question we should ask is this: why does Sherlock Holmes never mentions his parents, not even if they are alive or dead? It seems strange, doesn’t it? Here are a few more questions which follow:

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