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A relative clause tells us which thing or person the speaker means.

"The man who works in the bank is my brother" - 'who works in the bank' tells us which man.

We use who in relative clauses for a person. Who is followed by a verb.
We use whose in relative clauses instead of his/hers/theirs. Whose is followed by a noun.
We use where in relative clauses to talk about a place. Where is followed by a noun or pronoun.
We use which (and that) in relative clauses to talk about a thing.

that	people, animals and things; informal	defining only
whose	possessive meaning; for people and animals usually; sometimes for things in formal situations	defining and non-defining
whom	people in formal styles or in writing; often with a preposition; rarely in conversation; used instead of who if who is the object	defining and non-defining