what do we know about derek's sisters??
well, from what i can tell
derek has 4 sisters
amelia (private practice)
Nancy( greys season 3 episode 6)
Kathleen (mention also in season 3 episode 6)
last one unknown..
is this all we know.. cos i was thinking of nghề viết văn a người hâm mộ fiction story about them.. and just wanted to be sure if what i know is right of if i'm missing anything.