The Spirit of God made Mark and John to write down the Gospel of Jesus Christ slightly different perspective than Matthew and Luke, when Matthew and Luke starts with the birth of Jesus Christ, and how the old testament prophecies are fulfilled in the family line of Abraham and David, The Book of Mark and John starts just by telling the relationship between Christ and the Heavenly Father.
It is necessary to declare how the old testament prophecies are fulfilled in the birth of Jesus Christ, so the genealogy of Jesus Christ recorded in the Book of Matthew and Luke, but the Book of Mark and John does not say much about Mary and Joseph, because if we receive some valuable gift from foreign country, we must be thankful to the person who sent the gift, and not to the person who delivered it, so, the Book of Mark and John did not say much about Mary or Joseph, because the Heavenly father, the one who sent his only begotten son to save us from the eternal hell, and we should be thankful to him alone, and not to any man.
The Book of Mark starts like this "The beginning of the Gospel of Jesus Christ, the Son of God", and then teach us the love bond between the Son Jesus Christ and Heavenly Father, in those days Gospel books are written independently and used as separate copies and not as a whole Bible, so those who read the Book of Mark alone, will not know much about Mary or Joseph, because the Book of Mark teach us only about Heavenly Father and the Son Jesus Christ - 9.It came to pass in those days that Jesus came from Nazareth of Galilee, and was baptized by John in the Jordan. 10.And immediately, coming up from the water, He saw the heavens parting and the Spirit descending upon Him like a dove. 11.Then a voice came from heaven, You are My beloved Son, in whom I am well pleased - Mark 1:9-11
In the same way, Book of John also starts with the relationship between the Heavenly Father and the Son Jesus Christ, so the Churches which had the copies of Book of John alone will know nothing about Mary or Joseph, for them the Mother of Jesus is our Heavenly God, because Book of John teaches our Savior Jesus Christ came from the Bosom of Father, like women giving birth to the baby - 14.And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth. 15.John bore witness of Him and cried out, saying, This was He of whom I said, He who comes after me is preferred before me, for He was before me. 16.And of His fullness we have all received, and grace for grace. 17.For the law was given through Moses, but grace and truth came through Jesus Christ. 18.No one has seen God at any time. The only begotten Son God, who is in the bosom[the front of the body between the arms] of the Father, He has revealed Him - John 1:14-18
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