Jesus never said Joseph was not His biological father.
THE ADOPTION THEORY:
Christians first taught that God adopted Jesus when Jesus was baptized. Mark is the first Gospel and did not report a virgin birth; nether did Matthew at first.
Mary would not have entered Joseph's home prior to her their wedding Night (Jewish custom).
Angel Gabriel appeared to Mary in Joseph's home in Nazareth because Mary and Joseph were already married and shared that home. This home was referred to as Mary's home even before Mary became pregnant. Mary's cousin Elizabeth also visited Mary at this home instead of the home in a different town where Mary grew up with her parent.
Joseph was Jesus' biological father.
After his father's death Jesus was consider head of household under Jewish customs, being the oldest male child of the family.
Born Wednesday, August 21, 7B.C. Mary 16; Joseph 21.
Returned from Egypt at 2.5 years old after Herod died 4B.C.
Entered Manhood - Bar-mizpah 13 years old 21August,7 A.D.
Age 14.5, Father, Joseph died from fall while building young Herod's Capitol.
Baptized at noon Monday, January 14, 26A.D.
Official Ministry started at 33 years old middle of 26 A.D.
Died at 36.5 years old Friday, 7April30 A.D.
Jesus(oldest), James, Joseph, Simon, Judas(jude), Amos died at a young age.
Sisters: Miriam, Matha, and Ruth.
Mary's sister Salome was mother of James and John zebedee, Jesus' 1st cousins.