Who is XXX's sister?
Orodreth
In the published version of The Silmarillion, Orodreth (IPA: (oˈrodreθ)) was an Elf of the First Age, the second son of Finarfin (with Finrod Felagund, Angrod, Aegnor, and Galadriel being his siblings), and a ruler of Nargothrond.