A Dance with Dragons - Jon X Or will be soon. "A daughter comes before an uncle too. If her brother is dead, Karhold belongs to Lady Alys. And she has given her hand in marriage to Sigorn, Magnar of Thenn." "A wildling. A filthy, murdering wildling." Cregan's hands closed into fists. The gloves that covered them were leather, lined with fur to match the cloak that hung matted and stiff from his broad shoulders. His black wool surcoat was emblazoned with the white sunburst of his house. "I see what you are, Snow. Half a wolf and half a wildling, baseborn get of a traitor and a whore. You would deliver a highborn maid to the bed of some stinking savage. Did you sample her yourself first?" He laughed. "If you mean to kill me, do it and be damned for a kinslayer. Stark and Karstark are one blood."
1) The reference to wildling or wild blood seems to be an allusion to skinchanging abilities; something that ties Stark and Wildling bloodlines 2) The reference to a traitor and a whore... could this be the nature of the insult heaped on Lyanna to cause Brandon to go nuts and call out Rhaegar? The gallant fool and the reason why Robert Baratheon tells Ned she should have been buried under the sky to let the rain wash away the 'stain'. 3) The 'traitor' could be a reference to Robert Baratheon himself and this might add to the alt-RLJ theory.
Does Cregan Karstark know something of Jon's parentage? If the wolf parent is Lyanna, then he's saying Jon's father was a wildling. Are we back to Mance then? Or is he keeping the order intact, that the father is the wolf and traitor, while the mother is the wildling whore?