This is the only story we have about Jesus between His infancy and the beginning of His ministry roughly at age 30. Of course there are theories and tales galore, but this is the only reliable record of that period. One thing is clear about young Jesus; He knew who He was.
After the Passover was completed, His family set off for the return trip to Nazareth. It was a large party, and everyone seems to have assumed that 12-year-old Jesus was in the group, but after a day, Mary and Joseph headed back to Jerusalem to find Him; ah yes, 12-year-olds will get into mischief!
The Life Project. 2016. Jesus Visits the Temple | The Life Project. [ONLINE] Available at: https://lifereference.wordpress.com/2016/12/23/jesus-visits-the-temple/. [Accessed 26 December 2016].