This Greek Mythology Family Tree is depicted in a large series of charts that include a summary of the main gods, an illustration of Hesiod's Theogony, and a comprehensive eight-part set drawn from a wide range of ancient texts. When studying Greek mythology or any mythological story, remember that the stories and legends are all oral traditions that have gradually been written down over millennia. Over the years, poets, churches, and citizens have shifted, added to, and completely changed many stories. There is no one true storyline, and there is no single source for anything Greek mythology, so these stories should be taken with a grain of salt.