If a kid wanted to show respect he might say "Yes Uncle (first name)" or "Yes Mr (surname)". But not "Sir" to a relative - that went out of use here round about 1950 I think.
I've added this story to my recommended fics lists btw, at www.whitehound.co.uk/Fanfic/links/HP.htm
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I've added this story to my recommended fics lists btw, at www.whitehound.co.uk/Fanfic/links/HP.htm