Until Lucas decided we needed to know Darth Vader was Luke's father, who built c-3p0 a robot more human than vader to make a kind of irony.

Lucas likes to echo the stories in the prequels, but did we really need to know boba was a clone who was sad cause his dad died,lol.

That Luke and Anakin come both from the same world.

The retcons really started with empire depends on if you except vader as the father in V, and leia as the sister in VI or say its horseshit because that was not there when he wrote star wars 77.

When i see star wars when Obi Wan says Vader killed Luke's father that sounds literal and not like obi wan is lying. Lucas started by making him a horrible liar in V and then look at how much of a deceiving asshole he is by the prequels which are supposed to have been written before the other movies but were written in the late 90's to 2000's.

Sometimes i wonder how different it would be if the brackett script with Vader as the slayer of Lukes father and not his dad had been made. And if we really had a revenge of the jedi where the purpose is for luke to avenge his teacher and his father. But that would also have been at the time less mythic .