John and Jesus were the same age, God required Jesus to be baptized in water, the symbol for repentance, a turning toward God.  Jesus did not join John's movement.  These secular questions do not communicate the meanings within the bible, from the OT to the NT the message is the same, read.

The people using the Temple as a flea market of money changers was another example of the Israelites performing unclean acts in God's House.  The constant turning away from God and using the Temple for unholy things was the typical and continuing story of the Israelites throughout the Bible. The tension of relationships in the Bible is God chasing his people and his people constantly forgetting about him and returning to the worship of Idols.  The first Temple was destroyed by God because of idolatry and child sacrifice.  Even Solomon, the builder of the Temple turned away.

Jesus throwing the money changers out of the Temple would have notified the Pharisees and Sadduccees that God was back in the House. 

Jesus was responsible for his mother Mary until the day he died.  While on the cross he transferred the responsibility for his mother to John, his beloved disciple.

John 19:26  (John refers to himself in the second-person point of view throughout his Gospel)
     When Jesus therefore saw his mother, and the disciple standing by, whom he loved, he saith unto his mother, Woman, behold thy son!

It is our human nature to crave details real or imagined about any famous historical figure.  You cannot refute Jesus by saying you cannot find information about his young life because there is no information about anyone before they become famous.  Example:  no one can explain Leonardo DiVinci's early life, or William the Conqueror's early life either.  We want to know and we are not willing to not know, but you cannot refute his existence because you do not know.

We know Jesus' family was a traveling family.  Throughout the new testament there are versus that describe his family going to festivals and moving around as a large group even within Judea.  His family went down to Egypt to hide from Herod and the risk of being killed.

As Jesus grew his idea of "family" transformed from family of origin to the idea of a spiritual family.  This is why he mentions anyone can be his mother or his brother.

Jesus was a humble and meek personality by his own claims, so we would not have gone around stating he was the son of God.  In general he allowed others to tell Him who he was rather than telling them overtly.  Even his brother James wanted him to tell people he was the Son of God if he indeed was the Son of God, but Jesus refused.  Humility and lack of Pride are earmarks of perfect belief in God.

Jesus would not have wanted any testimony of his life to perform any other purpose than to bring glorification to God.  He came to fulfill God's promise and to glorify God.