When Judah tells Jacob that Benjamin must be brought to Egypt if the family is to purchase more grain, Jacob asks his sons why they had to mention the existence of a younger brother. Their response is that they were directly asked:
The man asked straitly concerning ourselves, and concerning our kindred, saying: Is your father yet alive? have ye another brother? and we told him according to the tenor of these words; could we in any wise know that he would say: Bring your brother down? (43.7)
However, to me, it sounds like the brothers volunteer this information after being accused of being spies by Joseph (42.7-13). (Shortened extract below.)
And Joseph remembered the dreams which he dreamed of them, and said unto them: 'Ye are spies; to see the nakedness of the land ye are come.'
And they said unto him: 'Nay, my lord, but to buy food are thy servants come. We are all one man's sons; we are upright men, thy servants are no spies.'
And he said unto them: 'Nay, but to see the nakedness of the land ye are come.'
And they said: 'We thy servants are twelve brethren, the sons of one man in the land of Canaan; and, behold, the youngest is this day with our father, and one is not.'
Am I missing something here, or are the brothers fudging a bit of what happened?