And Israel saw Joseph's sons and he said, "Who are these?" And Joseph said to his father, "They are my sons whom God has given me here." Was Jacob's poor eyesight the reason why he didn't recognize his grandsons? He failed to recognize them, Malbim explains, because to their grandfather they were foreign and culturally removed. To Jacob, Joseph defends his sons, saying these are the ones God has given me here. The reason he did not recognize his grandsons was because God had placed them all in a different cultural milieu, and not because they'd left the ways of their ancestors.