Both Esau and Yacqob, the twin brothers are fictitious characters. So, Jews are descendants of neither. If you want to know who the Jews are go back in time to Hyksos who invaded Egypt and Babylon, e.g. the forced detention of Jews in Babylonia. The Jews infiltrated Khazaria and took over the government and leadership positions. Just like they have done to more than 100 other nations. Shem, Ham and Noah are also fictitious characters made up by the Jews who wrote the Old Testament, the Torah. Actually they stole this story from the Sumerians, the Epic of Gilgamesh.