^ Yes, why the Luke and Leia being twins thing never made sense and can never make sense. I blame the following for making it even more nonsensical:
"We hid you from your father to keep you safe. Leia was formally adopted by royalty and grew up a princess. Got lazy with you Luke, so we dumped you on your father's home planet,
TPM. The prequels didn't need to make Anakin's home planet Tatooine, they didn't need to show he'd ever been to Tatooine, or ever heard of the place.
Correction: Actually, I remembered in SW Ben does say the line about Owen thinking Anakin should've "stayed here and not gotten involved", so it's not TPM's fault for that one.
ROTS. The prequels didn't need to show Anakin being aware of his missus being pregnant. Leia still remembers her being alive in ROTJ, so it would make more sense if she'd left Anakin when he turned evil, then the test came back positive.
ROTJ. If they were twins, raising them separately with different names made no sense, which was explained by the characters at the end of ROTS with "reasons?".
with your father's only known family,
AOTC. The prequels didn't need to show Anakin being aware of where the Lars were, it was only established that Anakin and Owen knew each other in SW.
at the same address he saw them at last. You should be fine if he never visits his mother's grave."
AOTC. Again this was made exponentially worse in AOTC.