He killed him with a sickle. And, by the way, the goddess of love and beauty (Aphrodite) was created when his Uranus's body parts were thrown into the sea and caused sea foam. Yum (sarcasm).
Khronos/Chronos/Cronos/Cronus/Kronos rebellied against his father Uranus not because he wanted the power, but to prove to his mother that he DESERVED the power. One day Gaea gave...
Gaea asked the titans for a volunteer to ambush Uranus and castrate him, Cronus volunteered because he probably wanted to show the other titans his power and make himself ruler of the universe