"Whom" is objective case like the pronouns him, her, them, me, and us. Use whom as the direct object, indirect object, or object of a preposition in a sentence.
Both the interrogative and relative pronoun 'whom' is objective case; used as the object of a sentence or clause.Interrogative: Whom will you tell? (you tell whom). Relative: The person, for whom I made this, is not here right now.
