WITH his bright blue eyes and roguish good looks, Mia Farrow's son Ronan never much resembled his father, Woody Allen, the hangdog film director and humourist.
Now, Farrow has explained that there may be a very good reason: the 25-year-old human rights activist could in fact be the son of Ol' Blue Eyes himself, Frank Sinatra.
Responding to years of speculation, the 68-year-old actress acknowledged her son was "possibly" fathered by the Rat Pack star, from whom she "never really split up" after their divorce in 1968. Sinatra's daughter, Nancy, confirmed to the magazine 'Vanity Fair' that Farrow was treated as a member of her family.
"He is a big part of us, and we are blessed to have him in our lives," she said. Making light of the disclosures, Mr Farrow said on Twitter: "Listen, we're all possibly Frank Sinatra's son."
His mother married Sinatra, who was 29 years her senior, in Las Vegas in 1966. However, he demanded a divorce two years later while she was filming 'Rosemary's Baby', the acclaimed thriller.
Farrow later embarked on a 12-year relationship with Allen, while also starring in a string of his films, in the 1980s. However, the couple were never married and they lived in separate homes.
Any confirmation that he is not related to Allen is likely to be welcomed by Mr Farrow. The Yale University graduate and former youth adviser to Hillary Clinton at the State Department has repeatedly criticised his supposed father in recent years.
The Oscar-winning director separated from Mr Farrow's mother in 1992 after having an affair with Soon-Yi Previn, one of the actress's adopted daughters, who was then 22.
Farrow later obtained a court injunction banning Allen from seeing Ronan and the then teenager changed his name to Seamus.
The Farrows have never forgiven Allen, now 77, who has been married to Ms Previn, now 42, since 1997 and has two adopted daughters with her.
"Happy Father's Day – or as they call it in my family, happy brother-in-law's day," Mr Farrow said on Twitter in June last year.
He has described Allen's actions as "a moral transgression".
Named Satchel Ronan O'Sullivan Farrow when he was born in 1987, Mr Farrow was presumed to be the sole biological child of Allen and Farrow, who were together from 1980. (© Daily Telegraph London)