Here's a look at their sibling rivalry and others just as bitter that have played out well beyond the family dinner table.
Fontaine, who won her Academy Award for Alfred Hitchcock's "Suspicion," died Sunday at 96.
For years, she was a struggling B-movie star watching the success of her older sister, who played Maid Marian alongside Errol Flynn's Robin Hood and Melanie Hamilton in an Oscar-nominated performance in "Gone with the Wind." But an Oscar eluded de Havilland until 1947, when she won for "To Each His Own."
The warring sisters' fame grew as they made history as the only siblings in Hollywood to win Oscars for a leading role. The two would snipe at each other in public, competing bitterly for the same roles and reportedly even for the same men.
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"My sister was born a lion and I a tiger, and in the laws of the jungle, they were never friends," Fontaine told an interviewer.
The two reportedly didn't speak again. Fontaine once told the Hollywood Reporter "I married first, won the Oscar before Olivia did, and if I die first, she'll undoubtedly be livid because I beat her to it.