B'reshis chapter 46 lists the seventy descendants of Yaakov who went to Egypt. It actually lists sixty-nine: let's assume Yocheved was the seventieth, as Rashi explains. It also lists (in pasuk 12) ...
While Yosef recognized his brothers, they did not recognize him. I heard a Rosh Yeshiva suggest that Binyamin, who wasn't so absorbed in the soap opera, was able to recognize Yosef, but played ...