The possessive form of the pronoun "who" is "whose".
Possessive forms of pronouns do not use an apostrophe, the pronoun itself is the possessive form.
The pronoun "whose" functions as an interrogative and a relativepronoun.
EXAMPLES
Whose job is cleaning the lunchroom? (interrogative use, introduces a question)
The one whose job it is to clean the lunchroom is posted on this schedule. (relative use, introduces a relative clause)
The possessive form of the singular noun husband is husband's.Example: My husband's job involves a lot of travel.
The possessive form of the singular noun person is person's.Example: A person's job does not necessarily define that person.
The possessive form of the singular noun senator is senator's.Example: I got the summer job as a senator's intern.
The singular possessive form of "test" is "test's".
The singular possessive pronouns are mine, yours, his, hers, and its. The singular possessive adjectives are my, your, his, her, and its.
The singular possessive is ant's.The plural possessive is ants'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is classmate's.
The singular possessive of dish is dish's
Taco's is the singular possessive.
The singular possessive is biker's; the plural possessive is bikers'.
The singular possessive is fish's.