Did Mary Have Other Children? The Perpetual Virginity of Mary
The Objection
It seems the answer to the question in the title is a plain "Yes." Several passages refer to the "brothers" of Jesus, to "his sisters," or to "James the Lord's brother":
"But knew her not until she had borne a son" (Matt. 1:25).
"And she gave birth to her first-born son" (Luke 2:7).
"Is not this the carpenter's son? Is not his mother called Mary? And are not his brothers James and Joseph and Simon and Judas? And are not all his sisters with us?" (Matt. 13:55-56).
"Is not this the carpenter, the son of Mary and brother of James and Joses and Judas and Simon, and are not his sisters here with us?" (Mark 6:3).
"After this he went down to Capernaum, with his mother and his brothers and his disciples; and there they stayed for a few days" (John 2:12).
"But I saw none of the other apostles except James the Lord's brother" (Gal. 1:19).
The objection usually runs like this. The Word of God clearly shows that Mary and Joseph had other children. That is why Jesus is called Mary's "first-born son" and not her only son. What matters is that Jesus is the only Son of God the Father, not that Mary was a virgin forever. Matthew says "until" in 1:25 to stress the virginal conception, with normal marital relations to follow. And the New Testament mentions the brothers of the Lord across several authors, which shows that Jesus had brothers and sisters born of Mary. Some add that the doctrine of Mary's perpetual virginity came from Roman paganism after Constantine's conversion.
It seems straightforward. Yet the Catholic does not need to prove from the Bible alone that Mary remained a virgin. He needs only to show that the verses have another explanation than that Mary bore these brothers and sisters, and that the Church has read them that way from the beginning.
What Scripture Does and Does Not Say
The Bible does not contradict Catholic teaching on Mary's role in salvation history, on the way Christians honor her, or on the dogma of her perpetual virginity in particular. Let us be clear about the biblical evidence:
No passage of Scripture directly states that Mary and Joseph had other sons and daughters.
No passage directly states that Mary ceased to be a virgin.
Every indirect statement that seems to point to other children of Mary and Joseph has a ready explanation.
Once these verses are correctly understood, they point toward the Catholic reading rather than away from it.
To these four biblical points we can add two from the history of the Church, especially the first five centuries, the age of the Church Fathers. First, the Fathers did not read the New Testament as teaching that the brothers of Jesus were children of Mary. Second, those who did hold that view were opposed by the Fathers, as Helvidius was answered by St. Jerome, one of the greatest biblical scholars in the Church's history, in 383.
"Until" in Matthew's Gospel
"But knew her not until she had borne a son" (Matt. 1:25). Matthew uses the Greek word heos ("until") to stress the virginal conception of Jesus, not to say that Joseph and Mary had children afterward. Heos can mark a change ("up to this point and no further"), but it can also mean "up to and through." It often marks a span of time without saying anything about what happens after it. Scripture is full of examples:
"At the end of forty days Noah opened the window of the ark which he had made, and sent forth a raven; and it went to and fro until the waters were dried up from the earth" (Gen. 8:6-7). The raven did not stop flying once the land was dry.
"And Michal the daughter of Saul had no child to the day of her death" (2 Sam. 6:23). Michal did not begin having children after she died. The author is speaking of her lifetime.
"The LORD says to my lord: 'Sit at my right hand, till I make your enemies your footstool'" (Ps. 110:1). The Lord's reign does not end once his enemies are subdued.
"For he must reign until he has put all his enemies under his feet. The last enemy to be destroyed is death" (1 Cor. 15:25-26). Christ's reign does not cease afterward.
So the word "until" in the Old and New Testaments does not state that Mary stopped being a virgin after Christ's birth. It stresses the uniqueness of Christ's conception within that span of time. In everyday English, "until" usually signals a change, but ancient Greek did not have to follow English usage. To insist that it does is not exegesis but eisegesis, reading into the text rather than out of it.
Mary's "First-born Son"
"And she gave birth to her first-born son" (Luke 2:7). In Scripture, "first-born" names the child who opens the womb, whether or not others follow. Luke himself makes the connection a few verses later, quoting the Law: "Every male that opens the womb shall be called holy to the Lord" (Luke 2:23; see Exod. 13:2). An only child was no less first-born than the first of many. The 1907 Catholic Encyclopedia makes the same point in its article "The Brethren of the Lord."
Luke's emphasis is on inheritance. In the agricultural cultures of the ancient world, wealth was mainly land and animals, not cash or gold, and the first-born son received a double portion of the inheritance (Deut. 21:17) because he was trained to follow in his father's footsteps. The Prophets then spiritualize this inheritance to describe Israel's covenant with the Lord. The New Testament carries it further to show the marvelous exchange we have in Christ. He took our human estate on himself in order to give those "in him" what belongs to him, the inheritance of eternal life with God.
As I once told a Jehovah's Witness who denied Christ's divinity, when the Creator enters his own creation, everything changes. When the Word through whom all things were made becomes flesh and dwells among us, everything is made new, because everything that exists now stands in a new relationship to its Creator. Jesus Christ is the first-born of the new creation, the first-born of the dead, and the first-born of Mary:
"For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the first-born among many brethren" (Rom. 8:29).
"He is the image of the invisible God, the first-born of all creation ... He is the head of the body, the church; he is the beginning, the first-born from the dead, that in everything he might be pre-eminent" (Col. 1:15, 18).
"And from Jesus Christ the faithful witness, the first-born of the dead, and the ruler of kings on earth" (Rev. 1:5).
Christ can be called Mary's first-born even if she had no other children. In Luke 2:7 the title means that Jesus is the heir to the throne of his father David, since he belongs legally to the House of David through Joseph.
The Brothers of the Lord
This is the hinge of most arguments against Mary's perpetual virginity. The lists of names seem like direct proof that Mary had other children. However, a careful reader will notice several striking details.
They are never called Mary's children. Every time the siblings of Jesus appear, they are called Jesus' "brothers and sisters," never "the sons and daughters of Mary." Jesus, by contrast, is called "the son of Mary" (Mark 6:3). That is remarkable, because Jesus is called the son of Mary and the others are called his brothers in the very same passage. How easy it would have been to write, "Mary's other children were there with Jesus, her first-born." None of the sacred writers does so.
"Brother" covers wider kinship. In Hebrew and Aramaic, "brother" regularly covers nephews, cousins, and other kin. Abram calls his nephew Lot his "brother" (Gen. 13:8; 14:14, in the Hebrew). Jesus and Mary spoke Aramaic, and the Greek of the New Testament carries that usage over. Then as now, sibling language also reached beyond blood relations, especially in religious settings.
Two of the "brothers" have a different mother. Matthew names the brothers of Jesus as "James and Joseph and Simon and Judas" (Matt. 13:55). At the cross, Matthew places "Mary the mother of James and Joseph" (Matt. 27:56), and Mark calls her "Mary the mother of James the younger and of Joses" (Mark 15:40). John identifies the women at the cross as "his mother, and his mother's sister, Mary the wife of Clopas, and Mary Magdalene" (John 19:25). Comparing these passages, the Mary who is mother of James and Joseph is "the other Mary," the wife of Clopas, and not the mother of Jesus. Many scholars also hold that Clopas and Alphaeus are two renderings of the same Aramaic name, which would make James "the brother of the Lord" the same man as the apostle "James the son of Alphaeus" (Matt. 10:3). Bechtel's article in the Catholic Encyclopedia sets out this identification in detail.
Jesus entrusts his mother to John. From the cross, Jesus says to his mother, "Woman, behold, your son!" and to the beloved disciple, "Behold, your mother!" (John 19:26-27). If Mary had other sons, handing her over to someone outside the family would have been unheard of.
The brothers held a place in the apostolic Church. The Gospels were written decades after the events, for readers who knew the Apostles and the early leaders of the Church, and the brothers of the Lord were important figures among them. John distinguishes them from the disciples (John 2:12). They are with the Apostles in the upper room: "All these with one accord devoted themselves to prayer, together with the women and Mary the mother of Jesus, and with his brothers" (Acts 1:14). St. Paul names them alongside the Apostles and Peter: "Do we not have the right to be accompanied by a wife, as the other apostles and the brothers of the Lord and Cephas?" (1 Cor. 9:5). Many point to John 7:5, "For even his brothers did not believe in him," but that unbelief was at the Feast of Tabernacles, not for the rest of their lives. Even among the Eleven at the resurrection, "they worshiped him; but some doubted" (Matt. 28:17).
The Church has explained these relatives in two ways. The Greek East has usually held that Joseph was a widower with children from an earlier marriage, which would make them step-siblings of Jesus. The Latin West has usually held that they were cousins. Either way, they are real relatives of Jesus, and Catholics have always held that. Neither reading requires that Mary bore them.
The Witness of the Fathers
St. Hilary of Poitiers, writing in 354, gives the Eastern explanation and grounds it in John 19:
"If they [the brethren of the Lord] had been Mary's sons and not those taken from Joseph's former marriage, she would never have been given over in the moment of the passion to the apostle John as his mother, the Lord saying to each, 'Woman, behold your son,' and to John, 'Behold your mother,' as he bequeathed filial love to a disciple as a consolation to the one desolate." (Commentary on Matthew 1:4)
St. Augustine preached on the perpetual virginity in a Christmas sermon around 411:
"It was not the visible sun, but its invisible Creator who consecrated this day for us, when the Virgin Mother, fertile of womb and integral in her virginity, brought him forth, made visible for us, by whom, when he was invisible, she too was created. A Virgin conceiving, a Virgin bearing, a Virgin pregnant, a Virgin bringing forth, a Virgin perpetual. Why do you wonder at this, O man?" (Sermons 186:1)
In 383, St. Jerome answered Helvidius, whose arguments against the perpetual virginity reappear in many Protestant writings today. Jerome holds that the brothers of the Lord were "brethren in point of kinship not by nature," and he appeals to the writers who came before him:
"Might I not array against you the whole series of ancient writers? Ignatius, Polycarp, Irenaeus, Justin Martyr, and many other apostolic and eloquent men, who against Ebion, Theodotus of Byzantium, and Valentinus, held these same views, and wrote volumes replete with wisdom. If you had ever read what they wrote, you would be a wiser man." (Against Helvidius 19)
In Summary
The biblical authors who mention the siblings of Jesus are naming real relatives of his. However, the New Testament never calls Mary their mother, and at least two of them can be traced to "the other Mary" at the cross. We can therefore say the following:
Mary is the Virgin Mother of Jesus, a unique relationship that the sacred authors protect and emphasize.
The siblings of Christ are relatives who followed him and held a recognized place in the apostolic Church as the brothers of the Lord.
The siblings of Christ are not the sons and daughters of the Virgin Mary.
Mary's perpetual virginity takes nothing away from the biblical testimony. It is a doctrine grounded in Scripture and Tradition, and it protects the Gospel message.
Like every Marian doctrine, this one is held because of who her Son is. It guards the singular, miraculous event of the Incarnation.
Source note: Several of the arguments above, including the identification of Clopas with Alphaeus and the meaning of "first-born" in Luke 2:23, are set out in F. Bechtel, "The Brethren of the Lord," The Catholic Encyclopedia (1907).