Definition of “whose” - Learner’s Dictionary

whose

pronoun, determiner uk us /huːz/
QUESTIONS

B1 used to ask who something belongs to or who someone or something is connected with:

Whose gloves are these?
Whose car shall we use?
CONNECTED WITH

B1 used to say that something or someone is connected with or belongs to a person:

She has a brother whose name I can't remember.

(Definition of “whose” from the Cambridge Learner's Dictionary © Cambridge University Press)