Why did the big three gods swear never to have chlirdren?

The big three gods—Zeus, Poseidon, and Hades—swore never to have children primarily due to a prophecy that foretold that their offspring could potentially overthrow them, similar to how they had overthrown their father, Cronus. They feared that their children might become powerful enough to challenge their authority, leading to further conflict and chaos among the gods. To prevent this cycle of rebellion from continuing, they chose to avoid parenthood altogether.