this version aka the one with Nelson Eddy (which Michael Crawford almost ruined for me with his concert story.
From their trivia:
The original script revealed Claudin to be Christine's father, who abandoned her and her mother in order to pursue a musical career. When this was excised from the final film, it left Claudin's obsession with Christine unexplained.
Not to mention the fact that she somehow knew the lullaby he played on the violin *facepalm*
Another bit of trivia: years ago they made a TV movie in my country based mostly on this version - and they actually put the part about the Phantom being her father.
And since the Phantom on LND is played by Ramin, technically the Phantom and Raoul are both Christine's father...