The Rosemary's Baby star Mia Farrow has hinted that her son Ronan, apparently with Woody Allen, may actually be the son of her ex-husband Frank Sinatra. The actress was married to the legendary singer from 1966 to 1968 though their relationship continued sporadically, including during her early years with director Allen.

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In a new interview with Vanity Fair's special correspondent Maureen Orth, Farrow hinted that it's entirely possible that Sinatra is the biological father of Ronan, now 25. When directly asked whether this was the case, Farrow said "Possibly," adding, "We never really split up."

In her piece for Vanity Fair, Orth asked Nancy Sinatra Jr about the fact that Ronan is treated as a member of the famous family, to which she replied in an email, "He is a big part of us, and we are blessed to have him in our lives."

Ronan was 5-years-old at the time of his parents much-publicised split, when Woody Allen's affair with his ex-wife's adopted daughter Soon-Yi Previn came to light. He was the subject of a fierce custody battle in the mid 1990s and has apparently not seen Allen for many years. Last year, Ronan incited chuckles in the internet community after tweeting, "Happy father's day. Or as they call it in my family, happy brother-in-law's day."

Allen's affair with Soon-Yi Previn - whom he married in 1997 - tarnished his reputation for years, though he fought back to re-establish himself as one of the world's finest filmmakers with Match Point, Midnight in Paris and his current Oscar tipped movie Blue Jasmine

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Frank Sinatra died at the Cedars-Sinai Medical Center in February 1997 following a heart attack. He was 82-years-old at the time of his death and would have been 78 at the time of Ronan's conception. A DNA test has apparently never been conducted, though speculation over the father has also been the subject of fierce speculation, particularly given Ronan's dazzling blue eyes and his likeness to Sinatra. 

A graduate from Bard College and Yale School, Ronan Farrow is a human rights activist, lawyer and government official. He served as a foreign policy official in the Obama administration and founded the State Department Office of Global Youth Issues. He also reported to Secretary of State Hillary Rodham Clinton as the United States' first Special Advisor for Global Youth Issues during the Arab Spring revolutions. 

For the past two years, Forbes magazine has ranked him as one of the '30 Under 30' most influential people in Law and Policy. In 2012, he was ranked No.1