According to Hesiod's Theogony, what is born first? What are her offspring?

According to Hesiod's Theogony, what is born first and their offspring are discussed below in detail explanation.

Explanation:

Hesiod's Theogony is a large-scale construction of a broad description of local Greek customs regarding the gods, created as an account that shows how they came to be and how they installed unchanging authority over the universe. Their first three children were Orthrus, Cerberus, and Hydra. Next appears the Chimera (whose mom is unclear, either Hydra or Echidna). Lastly, Orthrus (his spouse is unclear, either his mother, Chimera or Echidna) presented two children the Sphinx and the Nemean Lion.

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