Rhea.
Neptune
His mother is Rhea, and his father is Cronus.
It does not have a known name apart from 'trident'.
the function of Poseidons temple was for Poseidons honor.
cronus
Cronus and Rhea
Triton
a trident
He doesn't had friends
Give it back to Poseidon.
In myths, he does not have one.