Yes, Demeter was one of the 12 main greek Gods and Goddesses.
Zeus is a Greek god.
The king of Greek gods, is the sky god, father of all gods, one of the big three, is Zeus.
Greek gods are immortal, meaning that they live forever.
In Greek mythology, he is one of the twelve major Olympian gods.
No one in the modern world is related to the Greek gods and goddesses; they are mythology.
Titan gods are one generation up and gave birth to the Olmypion gods. The Olympian gods overthrew the titan gods and began ruling the earth.
Perseus
yes, Hercules is one of the gods in greek mythology. he is the son of Zeus he is a demi-god he was made a god when he was about to die
All Greek families start with Greek Gods and Goddesses. All Greek Gods and Goddesses hold common ties to the First Born primeval gods and goddess, including Gaea (Earth) and Ouranus (Sky).
Though there are many features of the Greek gods, I would say that a main one is their immortality.
Cleopatra was a descendant of Ptolemy I Soter, one of Alexander the Great's generals. She was a Macadonian Greek.