What happened, you may ask? Chaos and Anti's family was killed by a close friend of Chaos', Except for Anti and Yami. Chaos was framed for the death of his family...Upon hearing this, Yami feared her elder brother and 'silenced' herself to join her family. Anti is the only one to know the truth...
Chaos and Anti were born Chaos Lords adopted by the mortal family, at least...at the ripe age of 1870....maybe older than that?
(Yes, I know she looks like the girl from lazy town, leave that out of this, please π)