One of Jesus’ four half brothers. Mt 13:55; Mr 6:3
The opening words tell us that the letter was written by “Jude, a slave of Jesus Christ, but a brother of James.
Moreover, he calls himself “a brother of James,” evidently meaning the writer of the letter of James, who was a half brother of Jesus.
This James was well-known, and hence Jude identifies himself with him. This makes Jude also a half brother of Jesus, and he is listed as such. Gal. 1:19
However, Jude did not make capital of his fleshly relationship with Jesus