Acting on a prophecy that his life was in danger from one of them, Uranus did the natural thing and slaughtered them all. Their mother, his sister Gaia, was able to hide one son, Kronos. He married his sister, Rhea. When he learned of a plot against him, he cannibalized his children, but for Zeus, whose sleeping body Rhea had replaced with a stone. Zeus, of course, would castrate and kill his father.
Time is a bloodthirsty savage.
None of us gets out alive, regardless of piety, decency, beauty, or innocence. But Zeus, at least, made it tolerable by setting the clock of mortality and mutability. We die, but we are replaced. They can't admit it, but they want their parents dead. And parents can't admit it, but they want their children forever helpless and dependent.