I was thinking even if viren came to know about CC lie and she separated sid-nivi, how come it possible either DS or CC has to confess, I don't think both will confess as nivi requested DS not to tell and CC will not make a mistake by accepting this.
Nivi already know about this and she told DS that she wanted sid to marry DD and she accepted viren as her husband. I think even if viren try to sacrifice elders of soods will stop him except CC. my POV.