How did Yosef's circumcision prove he's Yaakov's son if he'd had all Egyptians circumcised? [duplicate]
It says in Rashi (Meketz 41:55), "for Yosef would say to them that they should be circumcised". Pharaoh agrees—so all men are circumcised. In Vayigash 45:4, according to Rashi, "והראה להם שהוא מהול" ...
Rashi to 45:4 says that when Yosef told his brothers to approach him, it was to show them his circumcision (presumably to prove he was Jewish). But how would that prove anything? All of Egypt had been ...