Wikipedia mentions this about the Ribhus:
Ribhus are depicted in some legends of the Vedic literature as three sons of the goddess of morning light named Saranyu and Hindu god Indra. In other legends, such as in the Atharvaveda, they are sons of Sudhanvan, which means good archer.
In Chapter XV of Book 2 of Vishnu Puran Ribhu is mentioned as a son of Brahma.
In either legends, they are famous for their creative abilities, innovation and they design chariots, the magic cow of plenty, channels for rivers, and tools for Indra and other gods, which makes many envious. Rigveda Book 1 Hymn 20 mentions:
1 FOR the Celestial Race this song of praise which gives wealth lavishly Was made by singers with their lips.
2 They who for Indra, with their mind, formed horses harnessed by a word, Attained by works to sacrifice.
3 They for the two Nāsatyas wrought a light car moving every way: They formed a nectar-yielding cow.
4 The Ṛbhus with effectual prayers, honest, with constant labour, made Their Sire and Mother young again.
5 Together came your gladdening drops with Indra by the Maruts girt, With the Ādityas, with the Kings.
6 The sacrificial ladle, wrought newly by the God Tvaṣṭar's hand— Four ladles have ye made thereof.
7 Vouchsafe us wealth, to him who pours thrice seven libations, yea, to each Give wealth, pleased with our eulogies.
8 As ministering Priests they held, by pious acts they won themselves, A share in sacrifice with Gods.
I find them similar to Ashwinis in a way that they also win the right to receive sacrifice but they're clearly not the same since the above verse mentions them creating a chariot for the Ashwinis. Also, wiki mentions them as having made their parents young again which is somewhat similar to what the Ashwinis did with Rishi Chyavan but then the rishi was not related to them.
I want to know the correct genealogy and function of these Ribhus since they seem to be even a step ahead of Tvashtar in their craft. Is there story mentioned in detail in any scripture?