The brother of the Goddesses Selene and Eos may be the natural father of what God?
Hyrmine:  She was the wife of Phorbas and by him the mother of the Argonauts Augeas, Actor and Tiphys. Hyrmine:  The natural father of Augeas by her may have been Helios. Helios:  He is the son of the Titan Hyperion and the Titaness Theia (according to Hesiod), also known as Euryphaessa (in Homeric Hymn 31) and brother of the goddesses Selene, the moon, and Eos, the dawn.
Argonauts Augeas