First, let’s talk about the most outstanding question: who are Rey’s parents? Now, some people have suggested Han and Leia, other’s suggest a connection to Luke, while still some others have offered an ancestral line related to one Obi Wan Kenobi; I disagree with all of the above. But, instead of offering my reasons against those arguments, let me offer one of my own: Rey is the daughter of Supreme Leader Snoke.
My theory is that, at some in the past, the Resistance caught wind of Snoke’s daughter (Rey) and her extraordinarily force-sensitive capabilities. In fear that Snoke may mentor Rey and guide her to the dark side, the Resistance kidnapped her and hid her from Snoke on Jakku. Then, in anger and in search of an apprentice, Snoke turned his attention to a force sensitive boy named Ben Solo (Kyle Ren) and persuaded him to join the dark side (we know this much to be true).
I believe that at some point in the future, Rey will learn the truth and be forced to decide between her actual family (Snoke and the dark side) and the one that kidnapped her, but has since taken her in as one of their own (the resistance and the light). In fact, I think this one would be a pretty difficult choice for Rey, because we know how much she values her family and friends. Make it happen, writers.