Hades is the god of the underworld , was the son of Cronus and Rhea . He had three older sisters, Hestia, Demeter and Hera , and two younger brothers , Poseidon and Zeus. They were all part of the Olympian gods.
Cerberus was a monstrous dog in charge of guarding the gates of Hades . Cerberus had three heads , although people say could have many more . Its tail was a snake on his back a mane made of stretched snake heads .