Sorry for taking so long.



In "Star Wars: The Clone Wars" the Ones were a family of cosmic beings that were basically the embodiments of the Force. The Son who symbolised the dark side, the Daughter who symbolised the light and the Father who balanced both.



The Son and the Daughter had an antagonistic relationship and were always fighting because that was their fundamental nature, but despite that they still loved each other as siblings. Until we get confirmation otherwise, I imagine Shinnok and Cetrion being similar.