No, Hercules's father was actually Zeus. Zeus slept with Alcmene, Hercules's mother in the form of her husband Amphitryon, who was a general, while he was out on a campaign. Therefore, Zeus was the biological father of Hercules.
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Alcmene was the mother of Hercules and the wife of Amphitryon, but the night she conceived Hercules and his twin brother Iphicles, Alcmene mated with both Zeus, who had disguised himself as her husband, and Amphitryon. As a result, Zeus was Hercules' father, but Amphitryon was the father of Iphicles. So Technically its only Hercules' half brother.
Amphitryon and Alcemene
Chiron the centaur trained Heracles to become a hero
Zeus and Alcmene. Alcmene and Zeus conceived him but he was also raised by Amphitryon (Alcmene's husband).
The messenger has no name, but only brings the information from Corinth, Oedipus' childhood home, that Oedipus' adoptive father, Polybus, is dead. Oedipus is happy because he thinks Polybus is his biological father and he didn't kill him so he defied the prophecy. That is the purpose of the messenger.