Game of Thrones season 7: Bran Stark actor reveals what he will do with Jon Snow information

Jon's true parentage is perhaps the most important secret in Westeros

The Game of Thrones season 6 episode 10 finale - ‘The Winds of Winter’ - saw Bran Stark finally get a glimpse inside the Tower of Joy.

He witnessed his aunt Lyanna passing a baby to his father Ned and getting him to make her a promise, but how much could Bran extrapolate from this flashback? Did he definitely know that the infant is Jon?

“That's a good question. I think he can probably work it out,” Bran actor Isaac Hempstead Wright told The Hollywood Reporter.

“You can see that crushed look on Ned's face. We don't hear a lot about what Lyanna says. Something along the lines of, "If Robert finds out, he'll kill him." Something to that effect. When Bran sees his father's reaction and understands that this is a surrogate child his father has brought up, he thinks to himself, ‘Well, wait, what surrogate children has my father brought up? Oh! Jon Snow! So Jon Snow isn't my half-brother.’ But we still are pretty clueless as to the father, I think.”

This father is widely believed to be Rhaeger Targaryen, improving not only Jon’s claim to being King in the North but his claim to the Iron Throne itself, should he actually want it.

“To me, I think what will happen now is that it appears Bran will head south to Winterfell,” Hempstead Wright said of his thoughts on Bran’s next steps.

“That's the thread that I would follow, at least. And then, hooray! He runs into Jon and Sansa. But I don't know how Bran's going to break it to Jon. He hasn't seen him in years. "Hey, yeah, by the way, I'm a tree wizard now, and dad's not your father." (Laughs.) I think Jon will go, ‘You've been spending way too much time in the cave, mate.’”

It remains to be seen how and when Jon will find out about his true parentage, but it will surely be used to dramatic effect - perhaps scuppering a romance with Daenerys at the last minute (they’re related) or turning the tide during a political squabble.

We don’t know the official release date for season 7 yet, but we can make a pretty good guess.