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Can you translate this as "why is your brother hiding himself" or "why is your brother out of sight"? Or does it really mean just "invisible" as in science fiction or in a fairy tale?
EDIT: According to Duden it means olny "invisible" just like in English http://www.duden.de/rechtschreibung/unsichtbar
so duo lingo's occasional bizzare and amusing translations are intended it seems...