Matthew 13:55
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?
Mark 6:3
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?” And they took offense at him.
Jesus was conceived in Mary by the Holy Spirit who was a virgin before she and Joseph consummated their marriage. Marriage is consummated by having sexual intercourse.
and His birth was prophesied in the OT
Isaiah 7:14
Therefore the Lord Himself will give you a sign: Behold, the virgin shall conceive and bear a Son, and shall call His name Immanuel (which means God with us). Jesus was fully God and fully man.
Matthew 1:25
New International Version
But he (Joseph) did not consummate their marriage until she gave birth to a son. And he gave him the name Jesus.
Mary & Joseph had several children (ie .. brothers & sisters) after Jesus birth and everybody on earth has always known how that happens ;o)
Nowhere in His word does it speak of Joseph having children prior to their marriage ... nor any kind of "adoption" going on either before or after the birth of Jesus.
Yep. This is it!
Just cause Mary had other children after Jesus doesn't take away from her forever blessed status in all our eyes.
26Now in the sixth month the angel Gabriel was sent from God to a city in Galilee called Nazareth,
27to a virgin engaged to a man whose name was Joseph, of the descendants of David; and the virgin’s name was Mary.
28And coming in, he said to her, “Greetings, favored one! The Lord
is with you.”
29But she was very perplexed at
this statement, and kept pondering what kind of salutation this was.
30The angel said to her, “Do not be afraid, Mary; for you have found favor with God.
31“And behold, you will conceive in your womb and bear a son, and you shall name Him Jesus.
32“He will be great and will be called the Son of the Most High; and the Lord God will give Him the throne of His father David;
33and He will reign over the house of Jacob forever, and His kingdom will have no end.”
34Mary said to the angel,
“How can this be, since I am a virgin?” 35The angel answered and said to her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; and for that reason the holy Child shall be called the Son of God. 36“And behold, even your relative Elizabeth has also conceived a son in her old age; and she who was called barren is now in her sixth month.
37“For nothing will be impossible with God.”
38And Mary said, “Behold, the bondslave of the Lord; may it be done to me according to your word.” And the angel departed from her.
he Magnificat
46And Mary said:
“My soul exalts the Lord,
47And my spirit has rejoiced in God my Savior.
48“For He has had regard for the humble state of His bondslave;
For behold, from this time on all generations will count me blessed.
49“For the Mighty One has done great things for me;
And holy is His name.
50“AND HIS MERCY IS UPON GENERATION AFTER GENERATION
TOWARD THOSE WHO FEAR HIM.
51“He has done mighty deeds with His arm;
He has scattered
those who were proud in the thoughts of their heart.
52“He has brought down rulers from
their thrones,
And has exalted those who were humble.
53“HE HAS FILLED THE HUNGRY WITH GOOD THINGS;
And sent away the rich empty-handed.
54“He has given help to Israel His servant,
In remembrance of His mercy,
55As He spoke to our fathers,
To Abraham and his descendants forever.”
56And Mary stayed with her about three months, and
then returned to her home.