Here's one that I came across the other day

Meera reed and job snow are twins. Meera is the 3rd head of the dragon

Meera and jon resemble one another, they were born in the same year

Meera and Lyana share the same personality characteristics

Howland owes Lyana for saving his butt for the knight at the laughing tree

It makes more sense that she would die giving birth to twins. Ned took jon and Howland took meera.

Ned, Howland and..Arthur dayne all witnessed this happen

Ned took jon to winterfell...Howland took meera to greywater and Arthur dayne decided to take the black because he felt dishonored by the fact that he failed to protect his best friend, rhaegar..

After hearing about the actor that plays theon say that jon snow family is similar to that of Star Wars, it made me think that jon(Luke) and meeta(leia) are long lost twins and mance rayder is not rhaegar(darth vader) but Arthur dayne(Obi-wann).

Bulldog bear...you're theory on rhaegar actually being mance just got me thinking that it could be dayne...one thing that got me thinking about it was the fight between jon and mance(disguised as rattle shirt)...mance pretty much manhandles him...jon states that mance swung his sword(a great sword) faster than jon could swing his..

Not too many of the characters could swing a big sword like that other than the sword of morning..

Just another crackpot theory