Bran knew that he was taking a risk, that the Three-Eyed Raven had not wanted him to try to meddle with the past. But to save his family, it was worth the risk that changing the past could pose. - Bran warns Rob about the Red Wedding.

Prologue

303 AL - Bran

The idea had come to him on the second night of traveling south with his Uncle Benjen, and it hadn't let loose its hold on his mind since.

The Red Wedding was just one of the events that the Three-Eyed Raven had crammed into his head. On the scale of the threats to Westeros, namely the White Walkers and the unceasing wars over the Iron Throne that stymied any hope of a cohesive response to the Walkers, it was an almost insignificant event. A footnote in history. To Bran it was something entirely different though.

He knew that the Three-Eyed Raven hadn't wanted him to try to meddle with the past, that he probably believed that for almost all rational cases the risks of doing so outweighed the rewards. But that was his family… his mother and brother.

He couldn't get the images of what happened to them out of his head… or the fact that he probably could change it.

He had thought about that during much of their ride south. He just couldn't help it. And it wasn't like he wanted to let his thoughts turn to the rest of the history that had been crammed into his head, or the fact that he now had the weight of the world on his shoulders. He didn't want to think about the inexecutable duty that he had just been handed - he had chafed under the duties of merely being Acting Lord of Winterfell. This was worse... but as father had always instilled, a man must do his duty.

But it was easier to simply not think about it for a short time. And so Bran had instead spent that time rethinking how he had got here, and whether or not the Red Wedding had any effect on it. He didn't think that it had, but Bran presumed that altering its course - warning Robb - would have some nasty side effects if stopping the Red Wedding would have invalidated how Bran came to learn how to use the Greensight in the first place.

That was most likely why the Three-Eyed Raven had tried to steer him away from meddling with the past in the first place. And even for his family… he couldn't risk whatever that may cause. He couldn't save Father or stop Theon and his betrayal and burning of Winterfell. Doing that would surely cause problems, and he did have a duty that he couldn't ignore and blindly risk, but first… first he would see if he could save Robb and Mother.

He had thought it through as much as he could during the rides and nights on their trip south. There wasn't a time, until when he had woken up and "become" the Three-Eyed Raven, that he knew how Robb and Mother died, only that he had suspected they might have been dead or doomed to die from the fact that they had showed up in his visions.

Stopping the Red Wedding would not have affected Bran deciding to go North to the Three-Eyed Raven's Cave. He should be able to save them

But he couldn't be certain that it wouldn't affect other people that Bran had run into when going Beyond the Wall. He didn't think it would have affected anything Jojen did, but Bran couldn't be certain that he hadn't seen some part of it using the Greensight himself. It was a small risk though, especially when Jojen didn't seem to have been influenced by seeing anything like that, but Jojen's attachment to him through their mutual ability of the Greensight was not something that Bran had a full grasp of. The Three-Eyed Raven had said that Jojen knew that he was going to die leading Bran north, so though he perhaps could have known about Robb and Mother's death somehow… it probably wouldn't have changed his actions.

And neither Hodor, Meera, Osha or Rickon could have known.

The issue wasn't their party, it was the other people they ran into.

The man from the Night's Watch that they had ran into… Sam was his name, he didn't know about the Red Wedding or he would have told them. And he couldn't have known by then anyways, considering that he had been coming from Beyond the Wall. So stopping the Red Wedding wouldn't have changed anything there.

What it could change was what happened at the Mutineers' Keep. He didn't think the Mutineers knew, or that they would care, but Jon most likely knew at that point. It was possible that knowledge of the Red Wedding had made him angry and more willing to take risks - and caused him to attack there while the Wildlings were marching on the Wall, so Bran would have to use the Greensight to make sure that wasn't the case. Otherwise… they wouldn't have escaped from the Keep and Bran would not have learned how to use the Greensight.

Bran didn't think that that was particularly likely, but the one guy that did concern him was the Watchmen who had tried to kidnap him during the attack. He had waited for Bran to confirm who he was before he acted, which meant that he must have been targeting Bran, or more likely the Starks in general.

If he wasn't there, and stopping the Red Wedding would likely change that, there was a good chance that they would have been freed at the end of the battle, and that Jon would have been there when it happened. And as Jojen said, Jon would have tried to protect him, and he would not have let him go north to find the Three-Eyed Raven.

Changing how that went was the biggest risk. He would have to investigate both Jon's reason for attacking the Mutineers as well as who that man was and why he was there.

Bran didn't think that there was anything else that would cause problems. Robb being alive would likely help with the fight against the White Walkers. His army wouldn't have been destroyed and he would have been able to use it against the Walkers. And it wasn't like Robb living would have ensured that Westeros wouldn't be unified and prepared, they weren't as it was now.

And Cersei would need to die anyways for Westeros to prepare for the Walkers, as she certainly wasn't going to be the one to do that.

The only other thing that Bran would have to do before warning Robb was finding some way to prove to him that the Boltons and Freys were going to betray him. Having his presumed to be dead brother yelling at him in his head wouldn't be enough alone, for Robb or for his Bannermen. He would have to find some proof of their treachery with the Greensight so he could lead Robb to it.

Bran had a plan, and he would be ready for when he got to they reached another Weirwood.

AN: I don't feel I did a great job with Bran's character, but whatever. He's a bit hard for me to write because we don't see him much and he has matured a lot mentally over the series. I don't have a good gauge for what he might be thinking.