She is the daughter of Demeter and Poseidon, identified with Artemis, Persephone, and Hecate.
Desponia is the daughter of Demeter, goddess of the harvest, and Poseidon the god of the sea; her name means "mistress" and her brother is Areion, a immortal horse.
Demeter's children were Peresephone, Desponia,Arion_(mythology), Plutus,Eubuleus, http://wiki.answers.com/w/index.php?title=Khrysothemis_(daughter_of_Demeter)&action=edit&redlink=1s, and Amphitheus_I
AREION (or Arion) was an immortal horse born to the goddess Demeter after she was raped by Poseidon in the shape of a horse. He was first owned by the Arkadian Ogkios, then by Herakles and finally by Adrastos.
Yes. Desponia, Arion, Ares, Athena, Apolo, Artemis, Aphrodite, Dionysus, Hebe, Hermes, Heracles, Helen, Hephaestus, Perseus, Mnos, Zagreus, Despoine, Plutus, and Philomelus are her siblings.
Yes. Any children of Demeter or Zeus would be her brothers and sisters, even if only half-siblings.Zagreus, Desponia, Arion, Plutus, Philomelus, Ares, Athena, Apollo, Artemis, Aphrodite, Dionysus, Hebe, Hermes, Hercales, Helen, Hephaestus, Perseus, Minos, and the Muses.