He is the son of the Titans Cronus and Rhea, and brother of Zeus, Poseidon, Hera, Hestia, and Demeter.
Consorts & Children:
One day, while his niece Persephone was picking wildflowers, he abducted her to his domain and made her his bride. Eventually, however, Zeus demanded Hades return Persephone to her mother Demeter, who was wreaking havoc with nature, but since Persephone had eaten a pomegranate from the Underworld, or half of a pomegranate in some accounts, Hades was allowed to spend half the year with his queen.
Notable Stories Involving Him:
As the eldest son, Hades was supposed to be supreme ruler, but Zeus, his youngest sibling, tricked him into drawing lots with him and their brother Poseidon. As a result, Hades became king of the Underworld instead. As such, he reigns over the dead, and is sometimes considered the god of wealth due to the jewels that are found underground.
The narcissus and cypress are sacred to him, and a helmet that can render the wearer invisible is his only attribute.
Hades Around the World:
His Roman equivalent is Pluto, though he's also been identified with the Roman Dis Pater, the Roman Orcus, the Egyptian Osiris, the Norse Hel, the Celtic Arawn/Gwynn ap Nudd, the Etruscan Aita, and the Chinese/Japanese Yama.
SOURCES: Greek Mythology.com, MythWeb, Encyclopedia Mythica, & Wikipedia