Calypso was a goddess nymph. Her father was the Titan Atlas. His other offspring were the Pleiades, the Hyades, Hyas, Maira, Dione and the Hesperides, so I suppose they can all be considered Calypso's siblings.
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The Greek god Poseidon was sisters with Hera, Hestia, and Demeter.
His brothers and sisters.
Hestia was the oldest child of her brothers and sisters
Any son or daughter of Hermes would be thought a half-sibling of Pan.
The Greek goddess of peace was Eirene, also spelled ad Irene. Eirene was a Horai goddess of the season of spring. Her sisters were named Dike and Eunomia.