Did Jesus have brothers and sisters?

The Gospels mention brothers and sisters of Jesus by name. Matthew 13:55-56 names James, Joses, Simon, and Judas, and mentions unnamed sisters. Mark 6:3 gives a nearly identical list. These references are straightforward, but their meaning has been debated since the early centuries of the church.

The question matters because it touches on the perpetual virginity of Mary, a doctrine held by Catholic, Orthodox, and some Protestant traditions. This guide explains what the New Testament says, what the Greek words mean, and how the major traditions have understood the evidence.

The Gospels refer to "brothers" (Greek adelphoi) and "sisters" of Jesus in multiple places. Paul refers to James as "the Lord's brother" in Galatians 1:19. Acts describes the brothers of Jesus praying with the apostles after the ascension. The New Testament treats these siblings as known figures in the early church.

James, one of these brothers, became the leader of the Jerusalem church and is traditionally credited with writing the Epistle of James. Jude, another brother, is traditionally associated with the Epistle of Jude. Their prominence in early Christianity is well attested.

Most Protestant scholars read the texts at face value. "Brothers" means brothers. Mary and Joseph had other children after Jesus. This reading is the most natural sense of the Greek and explains why the brothers are consistently grouped with Mary in the Gospels.

In Matthew 1:25, Matthew says Joseph did not know Mary until she had brought forth her firstborn son. The word "until" and "firstborn" both suggest that normal marital relations followed. This is not proof, but it is the most straightforward reading.

Jerome argued in the fourth century that "brothers" meant cousins. He pointed out that Hebrew and Aramaic used a single word for various relatives. The Greek word adelphos can occasionally have a broader meaning, though it normally means a biological brother.

The Orthodox tradition holds that these were children of Joseph from a prior marriage, making them step-siblings. This preserves the perpetual virginity of Mary while acknowledging the siblings as real people. The Protoevangelium of James, an early apocryphal text, supports this reading.

The New Testament does not settle the question beyond all doubt. The most natural reading of the Greek supports biological siblings. The cousin and step-sibling readings require assumptions not stated in the text but not contradicted by it either.

What is beyond dispute is that Jesus grew up in a family with other children, that those children became important figures in the early church, and that the relationship between Jesus and his family was complex, sometimes tense, and ultimately transformed by the resurrection.