In Greek mythology, Zeus had five siblings among the children of Cronus and Rhea.
They were Hestia, Demeter, Hera, Hades, and Poseidon. Cronus swallowed these children at birth because he feared a prophecy that one of his offspring would overthrow him. Rhea saved Zeus by hiding him in Crete and giving Cronus a stone wrapped in swaddling clothes instead.
Zeus later forced Cronus to disgorge his swallowed children. Although Zeus was the youngest child in this family, the rescued gods are often described as older than him because they had been born before he was. Together, they became central figures in the Olympian divine order.
The group includes both Olympians and a god whose usual realm was the underworld. Hades is commonly counted among the principal children of Cronus and Rhea, even though he did not normally live on Mount Olympus.