3. Meera Reed is Jon’s Sister
It’s well-established in the Game of Thrones universe that the Reeds and the Starks were close during Robert’s Rebellion against the Mad King; Howland Reed and Ned Stark were close friends. The show continues to show this closeness through the two Reed children, Jojen and Meera, guiding Bran on his journey to the Three-Eyed Raven. But what if the Reeds and Starks are closer than simply friends?
Reddit user MikeTysonsLifeCoach posited that Meera and Jon are actually siblings. The actual post is too long to paste here, but these are some of the highlights: Meera was born in the same year as Jon and Robb, but little is known of her mother. She is physically similar to Lyanna and Arya’s description. Twins increase the chance of death during childbirth. The actress who plays Meera also looks very similar to Jon Snow.
The author does note some holes in the theory. For instance, Meera has green eyes, which no Starks or Targaryens have. Also, Meera does not show up in any prophecies. This theory is entirely up to your opinion as a viewer. Meera is still alive in the show so her character must have some purpose, but I wouldn’t put too much stock in this theory.