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.
"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.
