What is the family tree of the gods?

Answer 1

He was descended from the Titans Cronus and Rhea. He had several siblings, and a few offspring (some with humans). I am redirecting this question to the Greek mythology section, where more will be known.
He is the son of Cronus and Rhea, and brother of Poseidon and Hades. He has many children.

Answer 2

Before we can talk about Zeus and Hera,let's talk about their parents and grandparents. Zeus and Hera's grandparents are Gaea(or Gaia) and Uranus. These two primordial beings had a group of 12children. These 12 beings where called the titians. Their names where Oceanus, Coeus, Crius, Hyperion, Iapetus, Cronus,Thea, Rhea, Themis, Mnemosyne, Phoebe, and Tethys. Zeus and Hera share the same parents,Cronus and Rhea. They also have Hestia,Demeter,Hades,Poseiden,and Chiron,who unlike his brothers and sisters was a centuar. Hera had Heaphestus on her own,and Zeus had Athena on his own,mostly. Hera and Zeus then had a child whom they named Ares and deemed God of War. Zeus had a child with a titan named Leto,and the result was Apollo and Artemis,god and goddess of the sun and moon. After this Zeus had a child with another titan whom's name was Maia. These two then had a child named Hermes,god of theives. How ever this was not enough for Zeus. Zeus had one last olympian child. This child's name was Dionysus. His mother was Semele. Semele was a mortal. When Dionysus invented wine,Zeus made him a god.

Answer 3

Zeus and Hera had Hephaestus, Ares, and the goddess of childbirth Ilityhia. They were siblings, their father Cronus, mother Rhea.

Answer 4

it is all on the first two pages of hesiods theogony