For all those doubting Rickon or Brans claim, remember this. It is believed by everyone south of the Neck that Sansa is the last living Stark. She only has claim after the death of Bran and Rickon. So for southerners, Sansa is heir. She is under the control of Littlefinger, and doing nothing of her own accord, but she is heir in the eyes of the Andal kings.
To the Mandery’s the Stark boys are still alive. Bran being lost to obscurity, or being a tree, isn’t fit, so the rightful lord of Winterfell is Rickon Stark. Davos is sent to find him, and Lord Mandery promises his backing and much of the north if Davos can install Rickon as Lord Stark of Winterfell. He is hiding on Skagos and we don’t have anymore information then that on him. If he’s a cannibal or not will probably depend on if he’s on a diet of unicorns or prey Shaggydog catches. Cannibal or no, he’s still first in line over Sansa, and the Stark the North will rally behind.
Then, you have Robb’s letter sent to Howland Reed. If Robb legitimized Jon, or gave inheritance to any of his men, those people would be heir to Winterfell and the North. As Jon’s fate is rather vague after ADWD it is hard to say what could happen, but Jon could side with Stannis which he would then give Jon or whoever Jon appoints Lord of Winterfell those rights.
I’m expressing an opinion of mine, Sansa will never hold the North. If she knew her brothers were alive, she would never take their rights from them. She might marry Harry the Heir, but she herself will never claim the North for the Arryns or the Starks.
I have the right to voice my opinions, if you don’t like them, ignore them. If you agree you can like them. I’ll tag them how I please, and I’ll say what I want. Sansa is not Queen. She is not fit to rule. Bran and Rickon are questionable as well, but they have the claim so it doesn’t matter. Sansa is not the Queen in the North. She is not the Lord or Lady of Winterfell. She is a Stone right now. Nothing more.