Vampyres

The Potamoi are the sons of Oceanus and Tethys, the gods of the rivers and streams of the earth. Their daughters are the Naiades.
Their names are Aias, Aigaios, Aisar, Aisepos, Akheloios, Akheron, Akis, Akragas, Almo, Alpheios, Amnisos, Amphrysos, Anapos, Anauros, Anigros, Apidanos, Ardeskos, Arnos, Askanios, Asopos, Asterion, Axios, Baphyras, Bolbe, Borysthenes, Brykhon, Elisson, Enipeus, …

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Oceanids
The Oceanids are a group of three thousand daughters of Oceanus and Tethys.
They were married to their brothers, the Potamoi.

Included among them: Admete, Akaste, Amphiro, Asterope, Beroe, Daeira, Dione, Dodone, Doris, Eidyia, Electra, Ephyra, Eudora, Europe, Eurynome (of which there were 2), Galaxaura, Hagno, Hesione, Hippo, Hyale, Iakhe, Ianeira, Ianthe, Kallirhoe, Kalypso, Kamarina, …

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Oceanus
Oceanus is the eldest Titan and god of the earth-encircling river bearing his name, which is also the font of all fresh water, and therefore Oceanus is the god of that as well. Seeing as the Greeks believed all heavenly bodies emerged and descended into this river each day, Oceanus also regulated that action.
He married his sister Tethys, and from her had the Potamoi and the Oceanids. …

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Khaos
Khaos is the elder sister of Gaea.
She is the lower atmosphere surrounding the earth, and the goddess of emptiness and confusion.
Presumably by herself, she is the mother of Nyx, and Erebus.