In Genesis 43 we see that necessity drives Jacob to send his sons back to Egypt to get more food, as they are running out and the famine isn’t letting up.  This need is forcing them to conform to the will of God.  But what they don’t know is that this is all part of God’s plan to allow them to grow into a nation, a nation of God’s chosen people.  Throughout all of this the relationship between Joseph and his family is being restored.