 Elijah Wood (qv)s sister is one of the refugees in Helms Deep, as  is Henry Mortensen (qv), Viggo Mortensen (qv)s son.  Philippa Boyens (qv) son Callum Boyens is the boy who gives  Aragorn his sword, but that isnt his voice in the final cut.  Callums voice had changed by the time it came to do the looping, so  a different voice was cast.