Bran was able to see into the past and watched as a younger Ned Stark found his sister, Lyanna, laying in a bed of blood with a newborn baby. Lyanna gave the baby (Jon) to Ned and asked him to protect him.

After the finale aired, HBO released an infographic naming Rhaegar Targaryen as Jon's father. This means Jon is a descendant of the two great houses of Westeros, the Starks and the Targaryens. It also means that he's technically Sansa's cousin and the nephew of Daenerys.

So Bran knows who Jon's mother is, but will Jon find out for himself?