Kids should stay away from post-PT wikipedia articles and all-girl acapella comedies for accurate Star Wars lore.
Read up on "The Journal of the Whills," George's first 40 page outline of the entire saga. Better yet track down a copy of "Star Wars the Annotated Screenplays" from 1997. That was the last publication where George spoke openly and honestly about the evolution of the OT. People worshipped him so much in the 70's, 80's, and early/mid 90's that it didn't bother him to admit the "making it up as I go" nature of the saga. But after the global vitriol that was caused by the SE's and PT he retreated and switched to a "but the SE's and PT were the original intention all along" stance in order to validate the finished narrative.
Darth Vader was NOT originally Luke's father. Luke himself wasn't even "Luke."
The original story had Annikin and Deak Starkiller, ages 16 and 10 respectively, stumbling across a landed Sith spacecraft on their homeworld. They investigate the ship but a Sith Warrior, "General Vader," emerges and kills Deak with a lightsaber (child slaughter actually is a vintage SW concept), causing Annikin to whip out his own lightsaber and duel Vader until his dad Kane shows up and *kills* the Dark Lord. Kane is mortally wounded and takes Annikin offworld to be trained by a 60 year old Luke Skywalker before he dies. Luke Skywalker was a "Dai Warrior," but Lucas didn't like that "Dai" sounded like "die" as in death or dying so he changed it to Jedi. Lots of SW names have overlapping connotations. The name Vader predates the finalized "hero being the son of the villain" plot point by many years and the Vader/Father correlation is a happy accident, nothing more.
