They separately served Joseph, his brothers, and the Egyptians. They ate separately because the Egyptians would not eat with the Hebrews, since that was detestable to them.
32. Because the Egyptians might not eat, etc “At the entertainment to which Joseph invited his brethren, they sat apart from the Egyptians, while Joseph was again separated from both. The author [Moses} shows the reason of this in the remark, ‘Because the Egyptians might not eat bread with the Hebrews, for that is an abomination to the Egyptians.’ Herodotus also remarks, that the Egyptians...
Here is, I. The great respect that Joseph's brethren paid to him. When they brought him the present, they bowed themselves before him (Gen 43:26); and again, when they gave him an account of their father's health, they made obeisance, and called him, Thy servant our father, Gen 43:28.
Commenting on Genesis 43:26-34
And they sat before him,.... At a table, so placed that they were in his sight, and he had a full view of them: the firstborn according to his birthright, and the youngest according to his youth; everyone according to his age, Reuben, the firstborn, first, and so on to Benjamin the youngest: thus they placed themselves as they used to be in their father's...