wessen (Nomen)

1

de quién (n)

wer, Interrogativpronomen - sing., interrogatives Determinativ - f. Sing., interrogatives Determinativ - m. Sing.
2

quien (pronoun)

of whom (interrogative)
3
Interrogativpronomen - pl., interrogatives Determinativ - f. Pl., interrogatives Determinativ - m. Pl.