Genesis 42:11 - Ellicott's Commentary On The Whole Bible

We are all one man’s sons. — Joseph’s brethren had probably expected this accusation, and their answer, as Abravanel points out, is a sound one: for no man would send his whole family on so dangerous an errand. And thus they press their family relations as a proof of their being true, that is, honest, just men, with no evil designs; and Joseph, who was glad in this way to obtain intelligence of his father and Benjamin, finally, after persisting in the accusation until he had learned all he wished to know, accepts their argument as valid.