Who was Posedians kids?

• These are Posedians kids:
• Amphitrite (a Nereid) Offspring: Triton
• Medusa (the woman whose hair was snakes and who turned men to stone) Offspring: Pegasus (famous flying horse), Chrysaor
• Demeter (or an Erinys or an Harpuia) Offspring: Areion (Adrastos' horse)
• Thoosa (daughter of Phorkys) Offspring: Polyphemus
• Iphimedeia Offspring: The Aloadai (Otos and Ephialtes)
• Tyro Offspring: Neleus and Pelias
• Periboia (daughter of Eurymedon) Offspring: Nausithoos (father of Alkinoos)
• Amymone (the fiftieth Danaid) Offspring: NaupliOS
• Pitane Offspring: Euadne
• Euryale Offspring: Orion
• Aithra??? Offspring: Theseus (possibly)

Source: Timothy Gantz' Early Greek Myth