**Additional evidence - the geneologies:
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Mk 15:40 There were also women looking on from afar, among whom were Mary Magdalene, and Mary the mother of James the younger and of Joses, and Salome,
Lk 6:15-16 and Matthew, and Thomas, and James the son of Alphaeus, and Simon who was called the Zealot, 16 and Judas the son of James, and Judas Iscariot, who became a traitor.
Mt 10:2-3 James the son of Zebedee, and John his brother; 3 Philip and Bartholomew; Thomas and Matthew the tax collector; James the son of Alphaeus, and Thaddaeus;
Mt 27:56 among whom were Mary Magdalene, and Mary the mother of James and Joseph, and the mother of the sons of Zebedee.
Jn 19:25-27 So the soldiers did this. But standing by the cross of Jesus were his mother, and his mother’s sister, Mary the wife of Clopas, and Mary Magdalene. 26 When Jesus saw his mother, and the disciple whom he loved standing near, he said to his mother, “Woman, behold, your son!” 27 Then he said to the disciple, “Behold, your mother!” And from that hour the disciple took her to his own home.
**Mary Magdalen’s offspring: none apparent.
**
Mary, wife of Clopas’ (or Cleophas) offspring: James the younger, Joseph, and sons of Zebedee (Matthew 27:56, Mark 15:40, John 19:25). James is called son of Alphaeus in Matthew 10:3, but Alphaeus and Clopas could be the same person, or the mother of James could have re-married. According to Hegesippus, Cleophas was the brother of Joseph, Mary’s husband, which would make James a first-cousin.
The Blessed Virgin Mary’s offspring: Jesus.
Also, note that Mary is given into the care of “the beloved disciple,” who is clearly not Mary’s son. This is not proper for a man whose mother has other sons - she would have been given into the care of a family member, not an unrelated person.
**The “until” argument:
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Gen 8:5 And the waters continued to abate until the tenth month; in the tenth month, on the first day of the month, the tops of the mountains were seen.
The waters diminished “until” the tenth month, but they kept diminishing even after that (or we would all be living on one square foot of land).
Mt 1:24-25 When Joseph woke from sleep, he did as the angel of the Lord commanded him; he took his wife, 25 but knew her not until she had borne a son; and he called his name Jesus.
**Neither does this imply that Joseph had relations with Mary after the birth of Jesus.
The first-born argument:
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Ex 34:20 All the first-born of your sons you shall redeem. And none shall appear before me empty.
Does this mean the first-born son wouldn’t be redeemed until the second son was born? “First-born” means no more than it says. This son was born, and he was the first. It doesn’t imply a second.