There once were two titans, Gaea and Uranus. They were madly in love.
When Gaea got pregnant, Uranus recived a prophecy that the children would overthrow him, so he blocked up the woom.
No, you cannot have these children!
Gaea plotted with the children to break out and defeat their father.
Oh no! we have been trapped in the woom! Let's break out!
Years later, Chronos and Rhea were having children, but Chronos received a prophecy saying that his children would overthrow him, so he ate them.
Rhea became unhappy with the fact Chronos was eating her children so she consulted a nymph by the name of metis. They hid the last child Zeus in a cave until he was grown up. To avoid confusion, Rhea fed Chronos a rock.
Many years later, when Zeus was grown up, he made a plan to attack his father, and chop him into pieces to let his siblings, the gods, free. After the killing, Rhea granted gods control over the world with Zeus being the leader.