Who's doing what to whom?

Jesus' actions are all about us. He was where he was because he had to be about his Father's business (or in his Father's house). Most translations have "Father's house." But the Greek says, literally, "about the things of my Father." Jesus shows that he is very clear about two things here. First that he knew there was a necessity to which he must attend if he was to be true to his identity as the Savior. Second, that Joseph as not his true Father. He was the Son of God. He knew where his allegiance lay.