Kashyapa and his Children | தேவர்களும் அசுரர்களும் பங்காளிகள் 

This explains about Children of Rishi Kashyapa through his 21 wives. Some article says that he had only 13 wives but in some puranic sources tell about 21. Both deva and asura born for different wives of Kashyapa. Nagas, Danavas, Gandharva also born for Kashyapa.