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.
Relative pronouns are words like who, which, where and whose. A relative pronoun serves two purposes. It acts as the subject or the object (who, which), the place (where) or possessive pronoun (whose) in the relative clause. It also serves as a conjunction connecting the two clauses.
I have a friend. She lives in New England.
I have a friend who lives in New England.