Of these brothers, Taraka is the demon the myths talk about.
The parents are Vajranga and Varangi. Vajranga is a son of Kashyapa and Diti. Varangi created Brahma himself for Vajranga.
Taraka had asked Brahma for the boon that he could only be killed by a son of Shiva. Since Shiva had lived in solitude since Sati’s death, the demon felt save. He became a plague and the gods agreed that one had to marry Shiva so that he could father a son. That son was Karttikeya. In some myths he also kills the brothers, in others he spares them.
Taraka had three sons, Tarakaksha, Kamalaksha, Vidyunmali. They built Tripura.
About Taraka read the Matsya Purana – starting with ‚Vajranga‘