Anakin and Owen were Step brothers....
Owen Lars was the son of moisture farmer Cliegg Lars and the stepbrother of Anakin Skywalker. He married Beru Whitesun, and after his father's death, he inherited his job as a moisture farmer. Beru convinced Owen to adopt Anakin's son, Luke Skywalker.
Owen was born on the Core World Ator, the homeworld of his birth mother, Aika Lars. Aika died when Owen was very young, so he and his father returned to his father's homeworld of Tatooine. Owen lived with his father Cliegg on their moisture farm. He helped his father buy Shmi Skywalker from Watto. Shortly after freeing her and her son Anakin's protocol droid, C-3PO, Shmi and Cliegg married, making her Owen's stepmother. Shmi often told her new family how much she missed her son Anakin, who had been freed by a Jedi to join the Jedi Order years before.
Over the next few years, Owen met a beautiful girl named Beru Whitesun, and the two fell in love. Beru moved in with Owen and his family and they lived contentedly together. However, tragedy would soon strike when Shmi was kidnapped by Tusken Raiders about a month before the start of the Clone Wars. Organizing a group of thirty other local settlers, Owen and Cliegg set out to find Shmi; however, their attempt was inherently doomed as the Tuskens set a trap. Only four of the settlers made it through, and Cliegg lost one of his legs. Owen built a hover chair for his father to maneuver following this injury.
Sean