Like everyone else, my initial reaction to Daisy Ridley's character Rey led me to believe 1 of 4 possible options:
1. She's Lukes daughter
2. She's Han and Leia's daughter
3. She's a Kenobi
4. She's related to Emperor Palpatine
But after watching a "special edition" of Episode 2, Attack of the Clones, I could not rule out that Rey's great grandmother is Padme's sister. Solaris. If you haven't seen the "special edition", then all you need to know is that Padme has a sister, and her sister already had 2 children. Whether or not the children were twins is unknown. But we know that they are older than Luke and Leia. We also know that right after Luke leaves Yoda and Obi-Wan, to face Darth Vader for the first time, that Obi-Wan says "that boy is our last hope". Yoda very quickly responds by saying "no, there is another". Yoda's response is what leads me to believe that Rey is not a Kenobi, Skywalker, Organa/ Solo, or Palpatine. Granted the "special edition" of Episode 2 has not been viewed by the mainstream, not yet anyway, but this is one theory of Rey's origin that had yet to be considered.