Metis, the Greek goddess of wisdom and cunning, is often considered to be one of the Titans, and her siblings are generally identified as the other Titan offspring of Oceanus and Tethys. These include notable figures such as Phorcys, Ceto, and Hecate. Additionally, Metis is the mother of Athena, whom she bore with Zeus, making Athena her most famous offspring. In some accounts, Metis is also considered to have a connection to the primordial beings, but her direct siblings are primarily Titan figures.
Athena's parents were Zeus and Metis and she didn't have any siblings!
Gaea, his grandmother and Metis, his first wife.
Athena relatives were Zeus (her dad), Metis (her mom), she had no siblings, no children, and no spouse.
to do matchmaking
Swallowed them; Zeus with the aid of Metis later made Cronus disgorge them whole.
hecate
No. Metis, her mother, was not married to Zeus. Athena can't really have step siblings if her mother was never married.
Nausicaa
Neither. She was Egyptian.
Poseidon did not come out of the stomach of Kronos, he and his siblings were spat up when Metis and Zeus tricked Kronos into disgorging them.
Persephone is the Greek goddess of innocence and queen of the underworld.
Yes; Hera is daughter of Kronos and Rhea.