The Forethinker Prometheus had a wife and child, though indeed, they weren't as well-known as he was. He and the Oceanide, the Goddess of Foresight Pronoia, gave birth to Deucalion, yet this son of the Forethinker couldn't obtain any godhood; his power was not even much stronger than that of an ordinary mortal.
Demigod, a term used sometimes to describe a state and other times to describe a race. And in this age, since the first mortal born with innate divinity had not yet come into being, demigod naturally refers to the latter.
Any first-generation descendant of a deity can be called a demigod, and Deucalion was such an existence.
Long before Prometheus attempted to deceive the gods, the Goddess of Foresight, like Epimetheus, had advised against it. However, unlike the Afterthinker, when persuasion proved fruitless, Pronoia directly sought refuge in the reclusive abode of Iapetus, seeking the protection of this Titan deity.
