Westeros Sorting

...and come to think of it, Greyjoy is the only great house where one full-blooded family member kills another for purely *political* power-grabbing reasons in canon. The Targs have done it in the past, IIRC, but we don't see them do it (and besides they'd roast Littlefinger and toast marshmallows over the flames). Tyrion becomes a kinslayer for emotional reasons, a desire for revenge. But IIRC none of the other great houses have a contemporary character who sneakily offs a blood relative because of politics. That's very Littlefinger-esque of the Greyjoys!