In the New Testament, Jesus is described as having several brothers, who are understood to be His half-brothers, sharing the same mother, Mary. The Gospels and other New Testament writings provide insights into these siblings, offering a glimpse into Jesus' earthly family life.

Names and References:
The brothers of Jesus are explicitly named in the Gospels of Matthew and Mark. In Matthew 13:55 , the people of Nazareth question Jesus' identity, asking, "Isn't this the carpenter's son? Isn't His mother called Mary, and His brothers James, Joseph, Simon, and Judas?" Similarly, Mark 6:3 records, "Isn't this the carpenter, the son of Mary and the brother of James, Joseph, Judas, and Simon?" These passages indicate that Jesus had at least four brothers.

Role and Belief:
Initially, Jesus' brothers did not believe in Him as the Messiah. John 7:5 states, "For even His own brothers did not believe in Him." This skepticism is evident during Jesus' ministry, as His brothers are portrayed as misunderstanding His mission and purpose.

Post-Resurrection Faith:
The brothers' perspective appears to change after the resurrection of Jesus. Acts 1:14 notes that they were among the early believers, gathered in prayer with the apostles: "All these were united in prayer, along with the women and Mary the mother of Jesus, and with His brothers." This suggests a significant transformation in their faith and understanding of Jesus' identity.

James, the Brother of Jesus:
Among Jesus' brothers, James emerges as a prominent figure in the early Christian community. He is often identified as James the Just and is recognized as a leader in the Jerusalem church. Paul, in his letter to the Galatians, refers to James as "the Lord's brother" (Galatians 1:19) and acknowledges his leadership role. James is traditionally credited with authoring the Epistle of James, a New Testament book that emphasizes practical Christian living and faith.

Jude, the Brother of Jesus:
Another brother, Judas (also known as Jude), is traditionally associated with the Epistle of Jude. This short letter addresses issues of false teaching and encourages believers to contend for the faith. Jude identifies himself as "a servant of Jesus Christ and a brother of James" (Jude 1:1), which implies his familial connection to Jesus.

Conclusion:
The brothers of Jesus, initially skeptical of His mission, became integral members of the early Christian community following His resurrection. Their transformation from disbelief to faith highlights the profound impact of Jesus' life, death, and resurrection on those closest to Him. James and Jude, in particular, played significant roles in the early church, contributing to the spread and establishment of Christian teachings.Matthew 13:55
Is not this the carpenter's son? is not his mother called Mary? and his brothers, James, and Joses, and Simon, and Judas?
Nave's Topical Index

Mark 6:3
Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him.
Nave's Topical Index

1 Corinthians 9:5
Have we not power to lead about a sister, a wife, as well as other apostles, and as the brothers of the Lord, and Cephas?
Nave's Topical Index

Galatians 1:19
But other of the apostles saw I none, save James the Lord's brother.
Nave's Topical Index

The Pentateuch.
... again, rest on false assumptions in regard to facts. ... of the great Antitype, which
is Jesus Christ, "the Lamb ... are necessarily of a very miscellaneous character. ...
/.../barrows/companion to the bible/chapter xix the pentateuch.htm

Who is Jesus Christ? | GotQuestions.org

Is there power in the name of Jesus? | GotQuestions.org

Is Jesus God? Did Jesus ever claim to be God? | GotQuestions.org

Jesus: Dictionary and Thesaurus | Clyx.com

Bible Concordance • Bible Dictionary • Bible Encyclopedia • Topical Bible • Bible Thesuarus