Jon Snow might not know who his parents are but us viewers along with Bran Stark himself(whose vision was the revelation of Jon’s true parents), are pretty much in the know of the fact that Jon is the child of Lyanna Stark and Rhaegar Targaryen. We don’t know when Jon will find out that he’s not the bastard child of Ned Stark, and until Game of Thrones season 7 comes out there is really no chance of finding out either. So Jon is as much unaware of it as we are.
However, Isaac Hempstead Wright, the actor who plays Bran Stark on Game of Thrones gave us a tease about when Jon might find out about his true parentage in season 7, during the San Diego Comic Con.
“Bran knows he’s been shown this information for a reason, he might not know exactly why, but it’s obviously imperative he knows this and will spread the word,” the actor said. He said he thinks the conversation with Jon might go something like this: “By the way, I’m a tree wizard, and your dad isn’t your dad.”
We’re surely awaiting this impending conversation when Jon finally finds out who his parents are!