Varus' sister, as far as we know, is as much of a sister to Varus as she is to any other Darkin! :)
I know it's stupid but I constantly see "Varus' sister" and it just rubs me the wrong way. Darkin usually call each-other brothers and sisters respectively due to the bond they share in immortality and being sun born etc.
But yeah, I know it means nothing but I just needed to make a post about this lol
Edit: Me saying "Varus' sister," in the title is deliberate ;) hehe