How did Joseph prove to his brothers that he was Joseph and not an Egyptian?
He had knowledge that only a brother could possibly have.
- He knew the birth order of the adult brothers. "And they sat before him, the firstborn according to his birthright and the youngest according to his youth; and the men looked in astonishment at one another" (Genesis 43:33).
- He spoke their language.
- He spoke with them. "Moreover he kissed all his brothers and wept over them, and after that his brothers talked with him" (Genesis 45:15). Thus, he could show he remembered events from childhood.