'Really' in the Bible

Then Isaac said to Jacob, “Please come close, that I may feel you, my son, whether you are really my son Esau or not.”

And he said, “Are you really my son Esau?” And he said, “I am.”

Then his brothers said to him, “Are you actually going to reign over us? Or are you really going to rule over us?” So they hated him even more for his dreams and for his words.