Io is the daughter of Inachus, a River God, and Argia/Melia. By others she is called a daughter of Iasus or Peiren.
Regardless, she was loved by Zeus and turned into a white heifer by him, she was then gaurded by the hundred-eyed giant Argus, who was killed by Hermes, she was then plagued by a gad-fly to torment or drive her mad - she traveled until she reached Egypt and became there the goddess Isis, her children were Epapus, Iasus, and Ceroessa.
Epaphus married Memphis or Cassiopeia and had Libya, Lycianassa and Dorus. With Poseidon, Ceroessa had Byzas.
Io
Io is an ancestor to Perseus
In Greek mythology, Zeus raped various women, including Io, Europa, and Leda.
Io is one of the moons of Jupiter, which was named after the Roman counterpart to the Greek god Zeus. Io was named after a woman in Greek mythology who had an affair with Zeus.
No siblings are known. Her father was Inachus, a river god.
Io and Europa are two of the 63 (known) moons of Jupiter. In Greek mythology, Io was a priestess of Hera and Europa was the queen of Crete; both were lovers of Zeus, whose Roman name was Jupiter. The continent of Europe is also named for Europa; the term has been in use since at least the 1st century CE (AD). The asteroid 85 Io is also named for Io.
Not really, though you could probably use a heifer or gadfly as her symbol.
No, Io was not a mortal. In Greek mythology, she was a priestess of Hera who was turned into a cow by Zeus to protect her from Hera's jealousy. Io was later transformed back into human form and became a goddess.
Io was a Naiad Nymph daughter of river Inakxos and Zeus. Her alternate name is Kallithyia meaning fine offerings to gods.
Io was named by Simon Marius, though it was discovered by Galileo.
Iuno. (Anglicized, it's "Juno.") In Greek mythology, it's Hera, Zues' wife.
Argos isn't considered a god in Greek mythology, Argos is actually a giant with many eyes and he is the son of Arestor. He is also the guardian of the nymph Io.