Yes the common trope of a desert planet with a powerful worm-like guy that has a face and arms having spice orgies in a palace. That’s just a common trope that exists… well just in Return of the Jedi and in God Emperor of Dune which was coincidentally published just around the time RotJ was being written.

And the old saw of someone having a vision of their lover dying during childbirth, trying to prevent it, getting an offer by an evil cloner dude to bring her back to life, and it ends up happening anyway, and surprise… it’s twins! That kind of stuff is all over mythology, right?

Hey I love Star Wars too, but come on, Lucas burrowed very heavily from Dune.