He ate them when they were born because there was a prophecy that one of them would overthrow him, but his youngest son Zeus survived because Cronus' wife Rhea gave him a rock to eat instead. When he grew up Zeus tricked his father into eating mustard and he threw his other children up, who were all still alive.
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Cronus is the father of Zeus. Cronus swallowed his own children. But Rhea saved Zeus and hid him from Cronus so he wouldn't swallow him. Rhea gave cronus a rock wrapped in cloth instead of Zeus so Cronus swallowed the rock.
Cronus didn't hide any children. It was his father, Uranus, who hid Cronus' brothers, Hecatonchires and Cyclopes.
Why did cronus swallow his children? Let ME explain this better. Cronus was told that the next son he would have would kill him and rule the gods. So, cronus ate his 5 children. But his wife hid the last child and gave cronus a rock instead of Zues and when he was old enough he had metis create a potion that would make cronus spit up the children he had swallowed. After the gods/godesses were out of cronus they all fought him. The titans helped cronus. The ttans were sent to tartarus where they would be punished forever and Cronus was killed.
Cronus
Cronus was a titan. He had children which were gods whom he ate to save his power. Luckily his wife saved one son, Zeus, who later made Cronus vomit up the other children.