Has NS verified that Cord is in fact Erasmas' half-sister? As best I recall, he refers to her as his "sib", a term which is unfamiliar to Jesry, and which Erasmas explains by saying something to the effect that in some families it is not always clear precisely how people are related. Also, Cord at one point refers to Erasmas as "coz", presumeably an abbreviation of "cousin".
We may want to go for the term "sib", instead.
I also have a quibble with "only known relative" as when Cord attends the Tenth Night dinner, she brings with her a mutual cousin, Dath, to whom Erasmas demonstrates a geometric proof, which merits its own calca at the back of the book.Jubaal 15:36, October 22, 2009 (UTC)