For years, fans have been asking for the Starks to reunite on Game of Thrones. And this year, the writers finally delivered, bringing Sansa, Arya, and Bran together in Winterfell. Well, almost. They're all different...
Bran was dragged through the snow for a few years and cooped up in a cave having visions and animorphing into various beasts. Sansa was subjected to multiple wars and terrorised by evil men after she watched her father get beheaded. Arya was a slave, a beggar, blind, and eventually an assassin after getting her ass beaten every day for an entire season. In other words, they all have some baggage.
So these greetings weren't as satisfying as one might hope. Which is fine, but not exactly fun for us viewers to see these hallow hellos and the awkward bickering and stares. But maybe there was a subtle detail that could be telling in how Bran greeted Sansa and Arya, as one Redditor pointed out:
When Bran reunites with Sansa at Winterfell (S7 EP3) he very clearly does not embrace her back when she is hugging him (we see a view that shows his hands remain by his side). In fact, while Sansa hugs him he stares blankly beyond her (which yes, I recognize is kind of his thing to do now). However, when he reunites (S7 EP4) with Arya he does hug her back (a view is shown with his arm around her), and while his face is still blank-ish, there definitely appears to be a hint of concern as he stares over Arya's shoulder at Sansa (who looks down). Bran knows that something is not right with Sansa and that she will likely do something that hurts her family. He made a point of arming Arya with that dagger, which he can see she will have to use for some reason not yet known to us. Will she have to kill Sansa?? Only Bran knows for now.
Let's take a look. Bran does seem less engaged when he's greeting Sansa. His hands are underneath that squirrel pelt cape and there's no sign of him making a move to hug her.
Now let's look at how he acted when he saw Arya. He was certainly more personable, and you can clearly see his hands around her. But, as the Redditor points out, he's staring directly at Sansa.
As another user pointed out, it's possible that Bran just needed some time to acclimate to becoming a regular-ass human. But that doesn't seem to quite fit with what we know of Bran now. He speaks in riddles, like his "chaos is a latter" comment to Littlefinger. Everything is deliberate—part of his role is seeing the future, past, and present all at once. He's doing exactly what he needs to do to set events in motion. That's why he hasn't told anyone about Jon's real parents or anything else he's seen in his visions. They aren't supposed to know yet. These clues could be as subtle as hugging his sisters when he sees them. Maybe he knows Sansa will betray the Starks. Maybe he knows Arya will be the one to kill her. That would be an intense turn of events, but in Game of Thrones, anything is possible. And if you think Bran's greeting is too subtle of foreshadowing, remember King Robert's first scene back in Season One, and how it predicted the fate of all the Starks?