Rey is undboubtely the hero of the new trilogy, and she is a hell of a mysterious character, man! Who is she? Who are her parents? Who is she related to.
Well, in this post i have the answer, and it is...
She's Snoke's Daughter (Kind Of)
Now, this must sound retarded as hell, but here me out on this: If Snoke is revealed as Darth Plagueis, then him influencing midichlorians could obviously lead to him impregnating Shmi Skywalker with Anakin, and thus Darth Vader, but after the supposed 'death' of Plagueis, Plagueis was in hiding, not wanting to be found by the Emperor who rose to UNLIMITAHD POWAR! (sorry, just a joke) who rose to power, and had a whole empire, with him being the leader so Plagueis chose the reasonable thing for him to do is to hide and not get his arse in too much trouble, so after making himself live through years and years with him influencing the midichlorians in him and allowing him to live for much longer than usual, so after the Empire fell, he heard news of Palpatine's apprentice turning against him, and his son planning to form the jedi academy , so he went and created another chosen one, to fool Luke into training Rey and he accepted and with Snoke fooling young Ben Solo into the dark side, so he could preserve his legacy, but after Snoke and Ben plan a slaughter and killing Luke and as they are ready to take Rey with them, Luke resists and believes the girl shouldn't be left with the likes of Snoke.
The students are all killed, after that, and Snoke and Ren leave after a battle with Luke and his now dead students, then Luke runs and hides out, and takes Rey with him, so after that, he assigns someone else to drop the girl on a planet to keep her safe, and with Unkar Plutt as her 'supposed' guardian (Probably not, that guy was a prick) and Luke leaves and researched the Jedi Temple in Ach-To, with him wanting Rey to live a peaceful live away from her evil as hell creator.
The Evidence To Back This Up?
When Maz and Rey talk after Rey's nightmare sequence, she says something like this (it's not 100% what she said, but still) : "The one you're looking for is never coming back, but there's still someone" then she says Luke, but who's that someone? Well, it could be anyone, but the last line rules out Luke as the father, so who's that someone?
2nd Piece Of Evidence:
When Ren is speaking to Snoke, in his first appearance in Episode 7, when he informs Snoke of Rey they both reffer to her as 'the girl' and they seem to know who Rey is exactly, and then Snoke says '..Bring...her...to..me' and it seems like they have a plan, and know Rey, and who she is.
3rd Piece Of Evidence- Rey Is Tempted To Kill Kylo Ren...by Snoke!
When the final battle is happening in Starkiller Base between Kylo Ren and Rey, and Kylo is down, striken by Rey's lightsbar, with the scar, and as you can see in the film, she looks angry and almost on the verge of darkness when she looks at Kylo. In the novel, Snoke tells Rey (through the force) to kill...Kylo Ren!
That is a handful of evidence that could mean this crazy theory holds up.
Now, i did a lot of research to make this post, but i know it may not be true, like, at all, mate. But it was fun to speculate.