Who is the Greek God grandparents?

The parents of the Greek gods are the Titans, who in turn are the children of the primordial deities Ouranos (the sky) and Gaia (the earth). The Titans included Cronus, Zeus, Poseidon, Hades, Hera, Demeter, Hestia, Rhea, Themis, Mnemosyne, Phoebe, and Iapetus.