From the Star Wars wiki:
During the
Galactic Civil War, Luke Skywalker began his training in the Jedi arts. By that time, the Jedi were all but extinct as a result of the
purge[17] that began with
Order 66.
[2] His mentors, Kenobi and Yoda, hoped that Luke—as a fully-trained Jedi Knight—would bring an end to the reign of the Sith.
[18] However, after learning of his father's true identity, Luke resolved to bring Anakin back to the light side of the Force.
[19]
Ultimately, it was Anakin Skywalker who restored balance to the Force by destroying both himself and his Sith Master, Darth Sidious,
[20][21] in order to save his son during the
Battle of Endor.
[19] Having fulfilled his destiny,
[20] Anakin joined Kenobi and Yoda in death as a
Force spirit.
[22]
Also this
Though there was some debate that Anakin Skywalker's son, Luke Skywalker, was actually the Chosen One since he caused his father to destroy Darth Sidious, the debate was settled when
George Lucas himself confirmed in an interview that Anakin, even after becoming Darth Vader, was still officially the Chosen One and not Luke.
[30] Darth Vader: Sith Lord, a
canon reference title, also states explicitly that "Anakin had fulfilled the destiny of the Chosen One."
