almonkey said:
obi wan was at the birth, he would always have known about Leia being Luke's sister wouldn't he?
Meaning that Lucas bolloxed up his own story line when he made ROTS.
I'm surprised he didn't "fix" that in the blu-ray set, to insure that the OT matches the oh-so-important PT in every detail. The obvious improvement would be to replace Yoda's "no, there is another" line, with simply "nooooo!!!".