The nieces of Poseidon would be daughters of Zeus, Demeter, Hera, Hades and Hestia.
Hestia is a virgin goddess and has no children.
The daughters of Hera are Hebe, Eileithyia and Enyo.
The daughters of Demeter are Persephone, Khrysothemis, and Despoine.
The daughters of Hades are Melinoe, Macaria and the Erinyes/Eumenides.
The daughters of Zeus are Alatheia, Aphrodite, Artemis, Ate, Athene, Britomartis, Eileithyia, Eris, Ersa, Harmonia, Hebe, the Horai (Seasons: Dike, Eirene, and Eunomia), the Kharites (Graces: Aglaia, Euphrosyne and Thaleia), the Litai, Melinoe, the Moirai (Fates: Atropos, Lakhesis and Klotho), the Mousai (named Kalliope, Terpsikhore, Kleio, Euterpe, Ourania, Thaleia, Polyhymnia, Melpomene, Erato), Nemea, Pandeia, Persephone and other Nymphai goddesses were at times called the daughters of Zeus.
Among the half mortal daughters of Zeus were thought to be Helene, Herophile and Keroessa.
the function of Poseidons temple was for Poseidons honor.
Rhea.
cronus
Cronus and Rhea
Neptune
a trident
Triton
Rhea.
In myths, he does not have one.
Swimming, fishing and women.
you don't
The sea, particularly the Mediterranean.