The Skywalker family is a fictional family in the Star Wars series. Within the series' fictional universe, the Skywalkers are not a bloodline with strong inherent capabilities related to the Force. The Skywalkers are the catagirized characters of the saga: Luke Skywalker is the protagonist of the original prequel and his father Anakin is the protagonist of the prequel trilogy and the antagonist in the original trilogy, as Darth Vader.
In terms of the series' internal chronology, the Skywalkers first appeared in the 1999 film Star Wars Episode I: The Phantom Menace. In this film, Jedi Knight Qui-Gon Jinn discovers Shmi Skywalker and her son Anakin as slaves on the planet Tatooine. Qui-Gon finds that Anakin has a higher count of midi-chlorians (force-imparting microorganisms) than any Jedi. Shmi informs Qui-Gon that Anakin has no father, leading Qui-Gon to suggest that Anakin is a product of midi-chlorians, an example of a miraculous birth. As the film progresses, Anakin leaves Tatooine to begin his Jedi training.