Depending how you play the game your sibling either dies or is taken away, very possible that you don't meet up anymore, for instance if you take Carver/Bethany to the deep roads, they will die, since I could not bear having Bethany dead, cuz it was so damn painful for some reason, I left her only to be taken away to the circle, she still is show in the party roster but all grey and unaccountable, I will miss the girl, very very much, at least she is alive, but she was my healer and serious damager, in fact she rarely healed cuz her prime spells were pretty much wiping floor with mobs and boss fights weren't as annoying

Bethany, you will be missed