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They were separated almost from the moment of birth.

Luke and Leia, the children of Darth Vader, had to be hidden from their father.

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Bruno Dayan/© 2017 Lucasfilm Ltd. All Rights Reserved

But they were also hidden from each other.

Fans ofStar Warshave never witnessed the dynamics of their relationship as brother and sister.

The big question is why didnt he respond to Leia during [The Force Awakens]?

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ILM/© 2017 Lucasfilm Ltd.

Theres a lot of things you cant answer until you see this movie.

Lucasfilm has said they will not be recreating her to deal with the princess-turned-generals storyline.

InThe Force Awakens, Leia needed Lukes help, and she couldnt fathom why he exiled himself.

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John Wilson/Lucasfilm Ltd.

But now he needs her as much as she needs him.

It would be an appropriate bookend if she turns up to rescuehimthis time.

She was always the stronger one.

How could he provide guidance to another?

He doesnt think he can help Rey.

He needs some guidance himself.

Hes not the happy-to-lucky farm boy any more, Hamill says.

Hes sort of bellicose and has the weight of the world on his shoulders.

But there is a lodestar out there for him, a powerful force beyond the Force.

The Last Jediwriter-director Rian Johnson says their shared history is an even stronger connection than shared DNA.

They are family, but even before learning that, these characters had become a found-family.

It was only at the end ofJedithat they became of aware of this bond, he says.

The real bond is that theyre Luke and Leia.

Theyve gone through this adventure together.

Theyve been through some rough stuff together.

Sister of Mercy

Whether they actually get that reunion inThe Last Jediisnt a given, though.

Its nice seeing them on the cover though.

Even if all we have is that, Johnson says.

If these star-crossed twins find each other again, itll be bittersweet.

If they dont, it will be tragic.

But heartbreak is a part of life, even in fantasy.

He has pushed her away, pushed the Cause away, but fans will learn his reasons for that.

It doesnt mean he doesnt want to find a way back.

Its very important for Luke to feel grounded and feel like he has a family.

I think he loves her dearly, Hamill says.

He doesnt finish the sentence.

But you know what he means.

Tomorrow,Star Warsweek on EW.com continues …