Zeus' parents are Cronus and Rhea who are 2 of the Titans.
Twelve Titan Gods and Goddesses:
Oceanus and Tethys,
Hyperion and Theia,
Coeus and Phoebe,
Cronus and Rhea,
Children of Hyperion:
Eos, Helios, Selene
Daughters of Coeus:
Leto and Asteria
Sons of Iapetus:
Atlas, Prometheus, Epimetheus, Menoetius
Those are all of his aunts and uncles.
Zeus married his sister, Hera. All of Zeus' other brothers and sisters are:
Hestia, Demeter, Hera, Hades, and Poseidon
He is the god of the sky, Poseidon is the god of the sea and Hades is the god Underworld.