Amalthea.

Amalthea (Ἀμάλθεια) (Amáltheia) was known as a nymph in Greek myths and legends. Also, she was represented as a goat.

Helios and Tethys were Amalthea's parents. 

She fed baby Zeus with goat's milk.

Amalthea had a cornucopia.

Perse.

Perse (Πέρση) or Perse, Persea. Perseis (Περσηίς) was one of the Oceanids in Greek myths and legends. Her parents were Oceanus and Tethys.

Helios, the god of the sun, married Perse. They had several children: Circe, Aeёtes, Pasiphaё, Perses, and Aloeus.

Also, Perse had many different siblings among Oceanids and Potamoi (Ποταμοί).

Tethys.

Tethys (Τηθύς) was a Titaness in Greek myths and legends. Her parents were Uranus (Οὐρανός) and Gaia (Γαῖα). Also, Tethys had many siblings among gods, goddesses, and other characters.

Oceanus (Ὠκεανός) was her consort. They have many different children.