Going only by Star Wars, do we know whether whether Owen was Annikin's brother, Beru was Annikin's sister, or if Lars was the maiden name of Luke's mother? Was Owen actually intended to be Obi-Wan's brother in 1983 like Obi-Wan says he is in the ROTJ screenplay and novelization or did Lucas drop that idea by the time ROTJ was released? Would Owen being Obi-Wan's brother preclude Beru from being Anakin's sister or Luke's mother's sister?

Also, I'd love to read the first edition of A Guide to the Star Wars Universe because it wouldn't be polluted by the EU.