Quote Originally Posted by geoduck View Post
Klaus certainly knows that Gil has a sister, but there's no proof he knows it's Zeetha. As for Zeetha, she should have figured it out, but she's not really one for making logical deductions.
I think her expressions when she was talking to Gil (while he recovered at Mamma Gikka's) were telling rather clearly that she did figure it out. Especially when she later learned that Klaus has shown Gil special techniques to stay away for many days straight. After all, she knows that Klaus talks fluent Skifandrian and I am quite sure there are not all that many outsiders that got to know it.