after Anakin left with Obi-Wan and Qui-Gon Jin. The man she married, I believe, already had sons, who were shown when Anakin went back and avenged his mother's death. Luke was placed with Anakin's stepbrother after he was born.
Phil Brown who played Luke Skywalker's uncle in Star Wars dead at 89 of pneumonia.
Would that not make him Darth Vader's brother? I don't recall any mention of him in the prequels.