After watching Star Wars The Force Awakens 9 times in the theater, as well as reading all the theories posted online. I really have to say if Rey is not a Skywalker its going to throw of the entire saga. If this movie isn’t about Anakin’s grandchildren then these movies should not be episodes 7,8,9. All the evidence points to Rey being Luke’s daughter Skywalker.
Rey is a Skywalker is because she is literally walking the path of her father before her. She is a manifest of the light side of the force. Kylo Ren (Ben Solo) is walking the path of the Dark Side. Its prefect yin and yang. The lightside of Anakin verses the darkside of Vader. Symbolically Anakin Skywalker is still struggling with the Light and Darkness after death. His grandchildren are the living fight of his soul. If Rey also has Anakin’s blood then Snoke will want her too which could lead to a very awesome story arch.
Everybody also knows who she is without saying who she is! Kylo Ren straight up knew her. He even says to her in TFA novel “it is you”. The hug Leia gave to Rey screamed its you. The biggest evidence is at the end when Rey finds Luke. He’s standing over a grave then turns to Rey. When she shows him the lightsaber I think two things were running to through his head. Shes alive..and she could fall too. Which is why his face is described as kind and happy but tormented. He also looked like he was going to burst into tears. The shot pans out to Luke the grave and Rey. The Grave may be Rey’s mother’s. The Saga has always been about the Skywalker bloodline. We are going to be getting new stories and characters with the anthology movies, literally have our cake and eat it too.