She is the daughter of the Titans Cronus and Rhea, and sister of Zeus, Poseidon, Hades, Hera, and Hestia.
Consorts & Children:
By Zeus, she's the mother of Persephone, queen of the Underworld.
Notable Stories Involving Her:
One day, while her daughter Persephone was picking wildflowers, Hades appeared and abducted her to the Underworld, where he made her his bride. At the loss of her daughter, Demeter let living things wither and die, until finally, Zeus demanded Hades release Persephone. However, since Persephone had eaten a pomegranate from the Underworld, or by some accounts half of a pomegranate, she was to spend six months with her mother and the rest of the year with Hades, thus bringing about the seasons.
Demeter's attributes are sheafs of grain and a torch, and items sacred to her include livestock, corn and grains, and the poppy.
Demeter Around the World:
Her Roman equivalent is Ceres, though the Norse Sif and the Celtic Áine are similar to her.
SOURCES: Greek Mythology.com, Mythweb, Encyclopedia Mythica, & Wikipedia