I'd go back to the dream he had that cause his brothers to cast Joseph into a pit in the first place. His dream entailed the sun, the moon, and eleven stars to bow down to Joseph. It was a prophesy that Joe's bros didn't take a liking to.
When Joseph finally rose to power, and his brothers come looking for food, Joseph had his brothers go and fetch the youngest brother, Benjamin, presumably because he wanted to see all his brothers. But Joseph also screwed with their heads to see if they were honest by planting the money back into their bags, perhaps to bring them to humility.
To make a long story short, in Genesis 43:28, they ended up fulfilling that prophesy, by bowing down to Joseph.
But I like the ending:
"And Joseph said unto them, Fear not: for am I in the place of God?
But as for you, ye thought evil against me; but God meant it unto good, to bring to pass, as it is this day, to save much people alive.Now therefore fear ye not: I will nourish you, and your little ones. And he comforted them, and spake kindly unto them.' - Genesis 50:19-21