The RotJ scene (as adapted for the novel) doesn't play out the way it did in RotS.
OBI-WAN
When I saw what had become of him, I tried to dissuade him, to draw him back from the Dark Side. We fought ... your father fell into a molten pit. When your father clawed his way out of that fiery pool, the change had been burned into him forever. (...) When your father left, he didn't know your mother was pregnant. Your mother and I knew he would find out eventually, but we wanted to keep you both as safe as possible, for as long as possible. So I took you to live with my brother Owen, on Tatooine ... and your mother look Leia to live as the daughter of Senator Organa, on Alderaan.
That scene also includes confirmation that Luke remembers his mother, too, although that might've been Kahn's invention and not Lucas's. It would have to be redubbed to conform to the RotS storyline.
OBI-WAN
When Yoda saw what had become of him, he ordered me to kill Anakin. We fought ... your father fell onto solidified lava and caught on fire. I imagine he clawed his way out after I left him screaming in pain, and the change had been burned into him forever. (...) Your father left because your mother was pregnant with you and he wanted to save her from dying in childbirth. I know it doesn't make sense, Luke, but I'm the one telling the story here. Turns out she died in childbirth anyway. We wanted to keep you safe as long as possible, and Bail Organa really wanted a kid, so I dropped you off with your Uncle Owen on Tatooine--boy was he surprised!--and Bail took Leia to live on Alderaan.