Amphitrite was a daughter of Nereus and Doris (and thus a Nereid), according to Hesiod's Theogony, but of Oceanus and Tethys (and thus an Oceanid), according to the Bibliotheca, which actually lists her among both the Nereids and the Oceanids..

Others called her the personification of the sea itself (saltwater). One of Amphitrite's Oceanid sisters is Perse, (wife of Helios). Amphitrite's offspring included seals and dolphins. Poseidon and Amphitrite had a son, Triton who was a merman, and a daughter, Rhode (if this Rhode was not actually fathered by Poseidon on Halia or was not the daughter of Asopus as others claim). Bibliotheca also mentions a daughter of Poseidon and Amphitrite named Benthesikyme.