I now tackle the question of deduction namely: “if they didn’t spend their childhood together why are they both so good at deduction? Mycroft must have taught Sherlock!”
Deduction as a skill is really not rare. It’s not something the Holmes Brothers have in common with just each other but something they have in common with a great deal of people.
Deduction is a skill they didn't have to have learnt from each other.
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