Final answer:
Hephaestus, the Greek god of the forge, had several half-siblings due to Zeus’s many relationships with goddesses and mortals, including Athena, Hermes, Apollo, Artemis, Dionysos, Aphrodite, and Ares, though an exact count is not consistently recorded across myths.
Step-by-step explanation:
The question asks about the number of half-siblings the Greek god Hephaestus had. Hephaestus is a deity from Greek mythology known as the god of the forge and craftsmanship. He was the son of Hera and, in some myths, Zeus. Given Zeus's reputation for having many children with various goddesses and mortals, Hephaestus had numerous half-siblings. Such siblings include Athena, Hermes, Apollo, Artemis, Dionysos, Aphrodite, and Ares. Since the number of offspring of Zeus is vast and not entirely consistently recorded across different myths, an exact number of Hephaestus's half-siblings cannot be conclusively determined.