Suetonius reports two traditions. According to one Caesar says nothing, according to the other he says "and you, son" in Greek. Suetonius doesn't elaborate on these traditions nor does he show preference for one over the other. One might note the similarity with the quote "the die is cast" (when Caesar crossed the Rubicon) which Plutarch claims Caesar uttered in Greek and not in Latin (it seems Caesar choose the quote from a play by the Greek playwright Menander).