For Yaakov (Jacob), a bitter famine coupled with his sons’ insistence comprised formidable tailwinds propelling him to Egypt. Still, he might have braved hunger and stayed put in beloved Canaan. Perhaps he could have resisted their incessant appeals had it not been for one irresistible magnet. Its force tugged and jerked mercilessly. Uppermost in the mind and heart of the aged patriarch was an image that he hadn’t been able to shake for two decades: Yosef’s (Joseph's) face.
Abravanel’s World of Torah Shemot Vol 1 pages 13-14