The gods of Illiad are a pretty unique pantheon of deities, namely in the fact that they're all related, and considered siblings to each other. The only exceptions would be the three deities of shadow, like Sh'ther Kei-Sihr, as well as his two spawns Tahvihsa and Prethao, who were all merely adopted into it; however, they're considered part of the family through this adoption.
Children of the Cathedral are also considered part of this family, and so are the lovers that some of the minor- and sometimes even major deities take.