Also in GWTW, Selznick tested a little known actress called Joan Fontaine for the part of Melanie. After the audition she suggested Selznick test her sister, Olivia de Havilland...
A year later, de Havilland returned the favour, when unable to get out of her Warner's contract to play the lead in "Rebecca", she suggested Selznick and Hitchcock hire her sister, Fontaine, which made a star of her.
Two years later, Fontaine, now a firmly established star, won the Oscar for her role in Hitchcock's "Suspicion" a good four years or so before de Havilland would win. De Havilland, who was a major name by the mid 30's was enraged at being up-staged by her little sister, beginning a lifelong feud which only ended with Fontaine's death in December last year.
Incidentally, at the time, both actresses, well into their 90's were two of the oldest living female stars from the golden years of picture making. De Havilland, at 98 lives in Paris and still occasionally attends award shows and screenings.
