"Do you know your sister's girlfriends?"
Translation:Znáte přítelkyně svojí sestry?
haha didn't think about it this way, you are totally right :) comes from doing too many things at the same time, sorry about it. as for the question it was kinda implied, in a shorthand way (again, due to doing too many things at once), but fair point, and noted. on the other hand, VladaFu, you tend to come off rather patronizing in your replies. hope you see the point yourself and note it, just like I did.