‘And they sat before him, the firstborn according to his birthright, and the youngest according to his youth. And the men marvelled with one another.'
They were no doubt informed that they must follow protocol and sit in order of seniority, the firstborn probably being nearest to the great lord's table.
“The men marvelled with one another.” The circumstances are so different from what they had been anticipating that they can only be filled with wonder. This great show of favour by the vizier has astonished them. Little are they aware of the real reason for it.