The-Lion said:It could work if you remove any reference of Anakin being Darth Vader. Then if you watch the movies in chronological order. You know that Anakin is Luke's father or some kind of family but you don't know he IS actually Vader. Then the line in ANH won't have to be changed. There's only one problem, Obi-Wan says that his student Darth Vader killed Anakin, but it's seems that Obi-Wan killed Anakin if you let him burn in Ep III.
Obi wan is lying to Luke anyway