Some TFA stuff
So Kylo was born 1 year after the battle of Endor, making him officially 29 years old in TFA
And Rey was born 11 years after the battle of Endor, making her only 19.
I think this automatically rules out the twin debate (as Han and Leia gave birth to twins in the comics), but I would also say it rules out Luke and / or Leia being either one of Rey’s birth parents.
Here’s my theory:
So glad that someone, with more knowledge of this than me, brought this up! I agree 100%.
Regarding the “Skywalker family” argument; Not every family has to be born by blood and not everyone in a story centering around a specific family has to be part of it. A family forming from a group of strangers is fascinating to watch!
Rey secretly being a skywalker makes me instantly think of fanfiction and I expect better storytelling and more innovation than that.
Also, there were already three Skywalkers in TFA, you really need more?