‘And he lifted up his eyes and saw Benjamin his brother, his mother's son, and said, “Is this your youngest brother of whom you spoke to me?” And he said, “God be gracious to you, my son.”
The writer is deliberately prolonging the welcome. He wants us to feel what Joseph felt. He is seeing his own blood brother after so long a time. And he gives him his blessing. The words come through an interpreter so that they are not aware of which god he refers to. Little do they realise that it is the God Whom they too worship.
“My son.” An indication of friendship from a great lord to a young man.
But in the end it is all too much for Joseph. As lord of Egypt he cannot give way to his feelings in front of his servants and he goes aside into a private room to compose himself.