I am a little confused about how to use ποιανού/ποιανής. Do these words agree with the noun that immediately follows or with the person they refer to, the 'possessor'? In my textbook there are the following questions: Ποιανού κόρη είναι η Ελένη; I would have expected ποιανής, since κόρη is feminine. Ποιανής θείος είναι ο Γιώργος; I would have expected ποιανού, since θείος. is masculine.