first-born: A legal term linked with a son’s social standing and rights of inheritance ref: Deuteronomy 21:15–17.
It does not imply that Mary had other children after Jesus, only that she had none before him
For example, as the only begotten One, Jesus is also the first-born Son of the Father. ref Jn 1:18 and again in Colossians 1:15.
Or you would be saying that the only begotten son of God had brothers and sisters when he became the Incarnate son of Mary perhaps?
Your scriptural argument is rather weak, because elsewhere in reference to Jesus the First-born son is more a mark of distinction re: Judeo inheritance rights and obligations rather than an emphasis purely on the sequence of birth.
Or might you be saying that Paul and John claimed in the above that God the Father was also the Father of more than one Son? Perhaps Jesus is only the First Son, and the Second Son is now the Holy Spirit, who should be called the Second Son of God, or maybe there exists more sons of God. Perhaps We shouldn’t say Trinity but Quadrinity or Polynimity? Absurd
So why the meltdown that Mary had other children?
What’s wrong with that?
There are plenty of other supporting verses to contend that Mary did indeed have other children.
Matthew 1:18-25 Now the birth of Jesus Christ took place in this way. When his mother Mary had been betrothed to Joseph, before they came together she was found to be with child from the Holy Spirit. And her husband Joseph, being a just man and unwilling to put her to shame, resolved to divorce her quietly.
But as he considered these things, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, do not fear to take Mary as your wife, for that which is conceived in her is from the Holy Spirit. She will bear a son, and you shall call his name Jesus, for he will save his people from their sins.” All this took place to fulfill what the Lord had spoken by the prophet: “Behold, the virgin shall conceive and bear a son, and they shall call his name Immanuel” (which means, God with us). When Joseph woke from sleep, he did as the angel of the Lord commanded him: he took his wife, but knew her not until she had given birth to a son. And he called his name Jesus.
Psalm 69:8 I have become a stranger to my brothers, an alien to my mother's sons.
Matthew 1:24-25 When Joseph woke from sleep, he did as the angel of the Lord commanded him: he took his wife, but knew her not until she had given birth to a son. And he called his name Jesus.
Matthew 12:46-47 While He was still speaking to the multitudes, behold, His mother and brothers were standing outside, seeking to speak to Him. And someone said to Him, “Behold, Your mother and Your brothers are standing outside seeking to speak to You.”
Matthew 13:55 “Is not this the carpenter’s son? Is not His mother called Mary, and His brothers James and Joseph and Simon and Judas?”
Mark 6:2-3 And when the Sabbath had come, He began to teach in the synagogue; and the many listeners were astonished, saying, “Where did this man get these things, and what is this wisdom given to Him, and such miracles as these performed by His hands?”... “Is not this the carpenter, the son of Mary, and brother of James, and Joses, and Judas, and Simon? Are not His sisters here with us?”
Luke 2:6-8 And while they were there, the time came for her to give birth. And she gave birth to her firstborn son and wrapped him in swaddling cloths and laid him in a manger, because there was no place for them in the inn.
John 2:12 After this He went down to Capernaum, He and His mother, and His brothers, and His disciples; and there they stayed a few days.”
Acts 1:14 These all with one mind were continually devoting themselves to prayer, along with the women, and Mary the mother of Jesus, and with His brothers.
1 Corinthians 9:4-5 Do we not have a right to eat and drink? Do we not have a right to take along a believing wife, even as the rest of the apostles, and the brothers of the Lord, and Cephas?
Galatians 1:19 But I did not see any other of the apostles except James, the Lord’s brother
Strong's Concordance
http://biblehub.com/greek/80.htm
adelphos: a brother
Original Word: ἀδελφός, οῦ, ὁ
Part of Speech: Noun, Masculine
Transliteration: adelphos
Phonetic Spelling: (ad-el-fos')
Short Definition: a brother
Definition: a brother, member of the same religious community, especially a fellow-Christian.
Here is a link to the occurrences of the Greek word *adelphos*.
http://biblehub.com/greek/80.htm
The word *sister* (adelphe) in the Greek is the same.
http://biblehub.com/greek/79.htm
The word used is *brother* not *cousin*.
It can't mean a member of the same religious community in the context in which they occur, because then that would mean every man in Israel could be identified as Jesus' brother. So that would not identify Jesus as anyone in particular's brother.
It's not going to mean *brother in Christ* as that concept was not yet in place and the Jews, who knew Jesus as a Jew and knew His brothers as Jews, would not even begin to understand the new birth and what being in Christ meant.
They didn't even understand who JESUS was, much less being a *brother in Christ*.
The only definition left then, is to mean physical brother.
And it would not be *cousin*.
The word for *relative* that is used for Elizabeth is *suggenes*, not *adelphe*.
http://biblehub.com/greek/4773.htm
Strong's Concordance
suggenes: akin, a relative
Original Word: συγγενής, ές
Part of Speech: Adjective
Transliteration: suggenes
Phonetic Spelling: (soong-ghen-ace')
Short Definition: akin, a relative
Definition: akin to, related; subst: fellow countryman, kinsman.
Joseph and Mary had sex just like any other normal couple and just like almost every other couple, they had a bunch of kids. His brothers are named and He had at least three sisters.