Margaery: I won't even know what to call you; sister? Or mother.
*Cersei rips Margaery's head off*

Isn't every new line basically just a usurper of the last? Saying that someone, or their family, are usurpers doesn't really hold much weight when pretty much everyone qualifies for that position.

Gee, Margaery Tyrell REALLY didn't seem all that interested in that pie she was feeding Joffrey, did she? The Tyrells are my number one guess as to who killed Joffrey.