His brothers are Zeus and Hades. He also had three sisters. They are Hestia, Demeter, and Hera.
Hades and Zeus are his brothers, his sisters including Hera, Demeter, and Hestia.
the function of Poseidons temple was for Poseidons honor.
Rhea.
cronus
I think that Poseidon's siblings are Zeus and Hades.
Cronus and Rhea
Neptune
a trident
Triton
Rhea.
Parents: Cronus (kronos) and Rhea Brothers: Zeus and Hades sisters: Hera, Demeter and Hestia Wife: amphitrite children: A whole list of them but most famous is Triton
In myths, he does not have one.