Who do you think Rey is the daughter of? If you have not seen this movie yet then why are you here? Go see it and come back here to discuss this!
[spoiler]Anyway, here's what I think. Because Luke's lightsaber lured her to it, and because she has a strong connection to the force, just like the sky walkers before her, I believe that she may be Luke's daughter. You could say that she is Han and Lea'd daughter, but that does not make sense when considering that Lea is not as strong with the force as Luke, and she never became a Jedi, along with Han not being force sensitive. Is it impossible for Luke to have had a wife? The rules of the Jedi order changed, and it's not unreasonable to think that Luke got married, maybe even to another Jedi, and that Jedi could have been killed by Kylo Ren. Of course there could also be a case of incest, which would, um. Never mind that. I don't think Rey would just be some random person who just happened to be extremely powerful in the force.[/spoiler] also autocorrect screwed me over, I meant Luke not likens. Now I can't really fix the poll option, so oh well.
Edit/update: Disney messed up and now we know the answer: http://youtu.be/D_0pFTKmsfs
[spoiler]Well, it turns out Rey is probably Luke's daughter,[/spoiler]
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She is not lukes, Jedis don't have relationships like that and Luke knows it. I haven't read this personally but I am to understand that she is the kid of a friend of lukes who was given a gift from the Jedi temple, and the gift stayed near the child's bed and that's where she became close to the force ( a little shaky theory to me but it's what iv been told)