LXX Gen 27:18

καὶ εἰσήνεγκεν τῷ πατρὶ αὐτοῦ· εἶπ’ πάτερ μου· ὁ δὲ εἶπεν Ἴδου ἐγώ· τίς εἶ σύ, τέκνον;

So Jacob went to his father and said, “My father.” “Here I am!” he answered. “Which one are you, my son?”