Whose

The pronoun who, in English, is an interrogative pronoun and a relative pronoun, used primarily to refer to persons. Unmarked, who is the pronoun's subjective form; its inflected forms are the objective whom and the possessive whose. The set has derived indefinite forms whoever, whomever, and whoseever, as well as a further, earlier such set whosoever, whomsoever, and whosesoever (see also "-ever").