system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] When (if ever) did Luke and Leia find out who their real mother was?

Who was a famous politician who ended a trade embargo and helped elect a unifying galactic chancellor.
gpt
In current canon, we don't know. It's likely that Leia had an idea who Padme was, considering her place in recent galactic history, but not her identity as her mother. 

In Legends, they spent about 3 decades hearing rumors, chasing lies and following hearsay until R2 showed a hologram of Anakin and Padme discussing something. Luke realized that the senator in the recording was his mother, and that was that.