Where in the bible does it say Jude is the brother of Jesus?

There are several references in the New Testament to Jesus' brothers and sisters. Matthew 13:55 lists four brothers: James, Joseph (Joses), Simon, and Jude (Judas). Some people prefer to call them half brothers of Jesus, since God was Jesus' father. The tradition in Roman Catholic Church, which holds that Mary was a virgin her whole life, is that they were cousins of Jesus. Another possibility is that they were Joseph's children from an earlier marriage.