Phorcys Phorcys is the father of the Graeae and the Gorgons. He and his wife, Ceto, are brother and sister.
(http://www.theoi.com/Pontios/Keto.html)
Ceto Ceto's daughters with Phorcys are the Graeae and the Gorgons. Ceto also mothered many other monsters.
(Gale, Medusa) The Graeae The Graeae are three disgusting creatures that share one eye. They are very needy of the eye. The Graeae live alone in a shack deep in the wilderness. They will freak out if you try to take their eye.
(http://www.fotomage.com/little-less-known-sister-of-medusa/) Euryale Euryale is the sister of the Graeae, Sthenno, and Medusa. She is a gorgon along with Sthenno and Medusa. Euryale is not the most famous gorgon.
(http://www. madesignimation.com /a_portfolio)/Stheno Sthenno Sthenno lived with her sister's Euryale and Medusa far apart from humans. Sthenno's other sisters are the Graeae. Sthenno is not the most famous gorgon.
(http://ronydraw.deviant art.com/art/Medusa-310488923) Medusa Medusa is the sister of Sthenno, Euryale, and the Graeae. She is the daughter of Phorcys and Ceto. Medusa and Poseidon had an offspring, Pegasus. Medusa was a gorgon, a snake-haired monster that would transform you into a stone statue if you looked in her eyes. She is the most famous gorgon.