I am aware of the way it is written correctly, and the reason I am asking about "whose" in the German forum is because "wessen" is indeed the equivalent to "whose." I am writing something where I say "whose is an example of case in English", but then I wasn't so sure about it, since it doesn't really act like it has case. But since "wessen" does have a case for sure, and it is essentially the same thing as "whose", I decided to ask the Germans, who know about cases in their own language much better than English-speakers do. So why exactly is this classified as a genitive?