weren't the Targs known for incest which is why they tend to go "mad"? (also hinted at that's why Joffrey was so sick and twisted)

they hinted at this with Dany and Rhay Rhay so i wouldn't be surprised if it's up to them to either duke it out or they go straight up parliamentary with it lol

the main issue with the incest seems to be not that it's gross but that it undermines the original bloodlines so i'm leaning towards nephew and auntie boinking it out or her coming to the agreement that King of the North is valid and they allow the secession of the North