Sforno on Genesis 46:5/ספורנו על בראשית מ״ו:ה׳

1וישאו בני ישראל, the reason why Yaakov’s children are referred to here for the first time as בני ישראל, “the Children of Israel, and not as “the sons of Yaakov,” is that from this moment on their task had become a twofold one, to do that on account of which their father had been accorded his additional name, title, “Israel.” From now on they faced challenges in their conduct vis-à-vis G’d as well as challenges in their conduct vis a vis their environment. This resulted from their becoming strangers in a land in which they had not been born and raised.

2את יעקב אביהם. Now that Yaakov was on his way to his final destination while alive, one which would not be followed by more suffering, disappointment, and upheavals, he had a foretaste of what is historically the ultimate destiny of Yaakov as described by the prophet Jeremiah 31,6 for the eventual glorious future of the Jewish people. The prophet describes it as רנו ליעקב שמחה, “cry out in joy for Yaakov.”