Near the beginning of The Horse and His Boy, Shasta finds out that he isn't the son of the man who has raised him (more as a slave than as a son), which makes Shasta very happy. Here is a little of that story:
"The story about his own discovery in the boat had filled him with excitement and with a sense of relief. He had often been uneasy because, try as he might, he had never been able to love the fisherman, and he knew that a boy ought to live his father. And now, apparently, he was no relation to Arsheesh at all. That took a great weight off his mind. 'Why, I might be anyone!' he though. 'I might be the son of a Tarkaan myself--or the son of the Tisroc (may he live forever)--or of a god!'"
When Shasta discovers that he is not the son of Arsheesh, the man who raised him as barely better than a slave, he is excited and a whole new world opens up to him. The possibilities of who he could really be are endless.
Like Shasta, we discover that who we think is our father (the world) is not really true at all. We are raised by this world, and treated as this world would treat people, only to find that we have another heritage, one far greater than any that this world could give us. The truth is, however, that we are the sons and daughters of a king--The King. As Christians, we are the brothers and sisters of Christ, and coheirs with Him in the Kingdom of Heaven.
Now is the time to start living up to your heritage...you are the child of a The King, so live and act like a child of The King.