The secret that reveals Odysseus is that the marriage bed is made from live olive roots. This convinces Penelope.
Eurycleia recognizes Odysseus purely by his scar.Eumaeus and Philoetius recognize Odysseus by his scar after Odysseus reveals who he is. Laertes, Odysseus' father, also recognizes Odysseus by his scar after Odysseus reveals his identity.
Odysseus kills them all...read it on sparknotes.
Island
Odysseus' dog Argus, and his nursemaid Euryclea recognize Odysseus without him revealing himself to them. Odysseus reveals himself to Telemachus in Eumaeus' home. Later on before the battle with the suitors, he reveals himself to Eumaeus the swineherd, Philoetius the cow herd, and a stockman. After stringing his bow and shooting through the 12 axe handles and Antinous' throat, he reveals himself to the suitors who then recognize him. Finally, Odysseus reveals himself to Penelope, who eventually believes that it is him.
No, Odysseus has them completely fooled, until he reveals himself after killing Antinous.
He asks him for proof.
To the suitors.
The first person he reveals himself to is his Son.
He reveals himself to his son Telemachus first.
Odysseus reveals himself to his son Telemachus and his faithful swineherd Eumaeus in Homer's epic, the Odyssey.
While in the underworld: Tiresias recognized Odysseus even before he had drank of the blood. Odysseus' mother Anticlea recognized Odysseus after drinking of the blood. Many former warriors recognized Odysseus, in particular Ajax the greater, who still would not forgive Odysseus after death. While disguised as a beggar by Athena: Argos, his faithful hunting dog, recognized Odysseus. Eurycleia, Odysseus' nurse, recognized Odysseus by his scar. Eumaeus and Philotius recognize Odysseus after he reveals himself to them. The suitors recognize Odysseus after he performs the contest's feat and reveals himself. Penelope recognizes Odysseus after revealing himself. Laertes also recognizes Odysseus after revealing himself.
Telemus, son of Eurymus, foretold to Polyphemus that Odysseus would one day blind him.