The Hollywood star-turned human rights activist dropped the bomb in an interview with Vanity Fair where her children came forward to talk about how their life changed when Allen's affair with Farrow's adopted daughter Soon-Yi became public in 1992.
Farrow said Sinatra, who divorced her after she opted to work on 'Rosemary's Baby' instead of his movie 'The Detective', was the great love of her life.
"We never really split up," Farrow said in an interview with magazine's special correspondent Maureen Orth, who had covered the scandal surrounding Farrow and Allen 20 years ago.
The magazine says no DNA tests have been done but Nancy Sinatra Jr said Ronan, who is treated as a family member in Sinatra family, "is a big part of us, and we are blessed to have him in our lives."
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Farrow broke up with Allen after finding out that he was having an affair with her adopted daughter Soon-Yi, whom he went on to marry later.
The actress, who had two adopted daughters and a biological son Ronan with Allen, subsequently took the director to court alleging that he had molested their adopted daughter Dylan, who was seven years old at that time. The charges could not be proved and Allen has denied the claims.
Dylan calls her fears "crippling" and says, "I'm scared of him, his image. I have never been asked to testify. If I could talk to the seven-year-old Dylan, I would tell her to be brave, to testify."
Farrow's second husband, Andre Previn, tells Orth of his adopted daughter Soon-Yi, who is now married to Allen "does not exist."
While Farrow's son Fletcher Previn has Photoshopped Allen out of every single family photo and edited him out of family videos so that none of them would ever have to see him again.