his father would die
Genesis 44:30
Now therefore when I come to thy servant my father and the lad be not with us, seeing that his life is bound up in the lad's life,
Genesis 42:38
And he said, "My son shall not go down with you, for his brother is dead, and he is left alone. If mischief befall him by the way in which ye go, then shall ye bring down my gray hairs with sorrow to the grave."