We sometimes use the relative pronoun "whose" in adjective clauses to show possession. "Whose" is used more often in writing than speaking. It is usually used with a noun as the subject of the clause but can also be used as an object. Adjective clauses with "whose" are also called possessive adjective clauses, with "whose" being the possessive relative pronoun. "Whose" can refer to people as well as groups, governments, corporations, and organizations. In some cases, "whose" can also refer to things. Adjective clauses with "whose" can be both defining and non-defining.