If we could that'd be awesome, but the key component is that we can't just make up evidence. The evidence has to be there, but it can be completely circumstantial.
Like, okay, here's one I have:
Theory
Sabé is Rey's Grandmother
Evidence
- A little known fact, but Sabé is played by actress Keira Knightley. Star Wars is of course not one of her more famous roles, and at the time, she just seems like a throwaway character, especially since she doesn't return in Episode II. Her entire role is based on the fact that she looks kind of like Padmé (Natalie Portman)
It's interesting to note, however that she bears a striking resemblance to another Star Wars actress: Daisy Ridley
A popular theory that many have regarding the prequel trilogies is that Obi-Wan and Padmé had a secret love affair behind Anakin's back. The evidence is there if you look and it's quite compelling. But what if Obi-Wan actually had an affair with not Padmé, but Sabé?
Think about it!
If Obi-Wan Kenobi had a child with Sabé through some sort of weird rebound after Padmé's death, that child would potentially be around Luke's age by the the time of A New Hope. We don't know what Luke was up to between Return of the Jedi and The Force Awakens, but it's entirely possible that he had a child with Obi-Wan's daughter, who would give birth to Rey, thus making her Sabé's grand-daughter.
MIND. BLOWN.
See, that's suitably ridiculous and riddled with circumstantial evidence and pure speculation, but also technically plausible