Does a dead sibling become a source of strength or guardian for a living sibling? An enemy? Does the living sibling absorb some of the qualities of the dead guy?
This thought arose on a recent thread and seemed worth consideration in its own post.
We have a number of important and POV characters whose siblings died in combat, tragically or violently:
Brienne / Galladon
Stannis / Renly
Jon / Robb
Tommen / Joffrey
Theon / Rodrik and Maron
Ned / Br