Sister

Agree with mantis down the line (except for having Cath off in time corridors, which seems far-fetched--more likely author understandably didn't want to have hero's Mom around and painlessly bumped her off). As for Merryn as sis-----well, we may find out more about this, as Wolfe has hinted that she may turn up in next year's book on Blue!!! Or is it Green??? -alga