In both Legends and current canon, Luke and Leia had been told at least some true information about their origins while growing up:

  • Luke knew that Owen and Beru were his aunt and uncle, and that his father's name was Anakin Skywalker, although he was told that his father had died and was a "navigator on a spice freighter".
  • Leia knew that Bail and Breha were her adoptive parents, as evidenced by Luke asking if she remembers her "real mother" in Return of the Jedi.

However, they don't seem to have had any suspicion that they might be related until Return of the Jedi, even though they were born on the same day of the same year and both knew they were both adopted under mysterious circumstances. Even if the Rebel military didn't celebrate birthdays, Leia would presumably have access to everyone's personnel file as a Rebel officer. This raises the question of whether they knew the real day (or location) of their birth, or whether their adoptive guardians told them something else.

Did Luke or Leia know when (or where) they were born? Answers from canon and Legends are both acceptable.

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    If you were adopted and met someone who was cared for by their aunt and uncle (so not the "same level" of adoption) and they were from Outer Mongolia and you were from Paraguay and you happened to have the same birthday, you would go "Wow this is a huge coincidence". You wouldn't jump to "We must be siblings." Jan 30 '20 at 17:20
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    When they shared birthday cards it probably came up - but surely people living in the Star Wars galaxy know about the "Birthday Problem": en.wikipedia.org/wiki/Birthday_problem
    – RobertF
    Jan 30 '20 at 17:32
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    Do we even have any evidence that they would have used the same calendar to keep track of their birthdays? For certain they weren't counting time relative to the Battle of Yavin in 19 BBY. And it seems unlikely that Tatooine was using whatever the standard galactic calendar was before then.
    – The Photon
    Jan 30 '20 at 17:32
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    @Valorum, "Historians" reviewing events after the fact do. People on a distant Hutt-dominated world with only tenuous connections to the empire?
    – The Photon
    Jan 30 '20 at 17:35
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    Oh, it also occurs to me: You are statistically LESS likely to be the sibling of someone who has the exact same birthday than someone who doesn't.... Jan 30 '20 at 19:23

According to the Leia Princess of Alderaan book by Claudia Gray, it says that Leia did not know the exact day of her birth but that they just went by when Bail brought her home to Breaha; and you learn in the Revenge of the Sith book that Bail, Yoda and Obi Wan watch Padme's funeral so we can assume that it's not the same day.


It’s statistically irrelevant in a galaxy with a gazillion people living in it.

There are 7 billion people on earth. That means around 20 million people have the same birthday you do on Earth alone. Now imagine a galaxy with millions of inhabited worlds. There’s, statistically, 20 billion people with your same birthday. You can’t make anything from it. In fact it’s a well known fact that sharing birthday is highly probable. It’s completely possible several people on the rebellion alone shared birthday with Leia and Luke.

So there really was no reason for them to extract anything whether day knew each other birthday or not other than “funny coincidence”.

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    This doesn't answer the question asked in any meaningful way. OP isn't asking if it would be a coincidence if they had the same birthday, they're asking if Luke and Leia knew.
    – Valorum
    Jan 31 '20 at 18:32
  • The question is asked as if it was relevant and significant for discovering their origin. They may very well like poker for all we know and have another thousand things in common that are not asked. The question assumes IMO that the fact foreshadows their shared lineage and therefore makes it a relevant fact they. Jan 31 '20 at 18:36
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    "Did Luke or Leia know when (or where) they were born?" - This answer doesn't address that in any way, shape or form. At best it's a (less succinct) repetition of an earlier comment
    – Valorum
    Jan 31 '20 at 18:38

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