Frank Sinatra may have fathered Mia Farrow’s son

Mia Farrow and Frank Sinatra on their wedding day in 1966. Picture: Getty

The Rosemary’s Baby actress was asked in an magazine interview if it could be true and replied: “Possibly”.

It has long been rumoured Ronan might be Sinatra’s son as the two have piercing blue eyes and no DNA test has ever been carried out.

Farrow was married to Sinatra between 1966 and 1968 but their relationship continued after that, including when she was seeing Allen from about 1980 onwards.

Sinatra’s daughter, Nancy Jr, told Vanity Fair magazine that Ronan was a “big part of us, and we are blessed to have him in our lives”.

Ronan, now 25, was just five when his parents went through a traumatic split that shredded Allen’s reputation.

Allen had an affair with Soon-Yi Previn, then about 20, who had previously been adopted by Farrow when she was married to composer Andre Previn – and was living in their home.

A custody battle ensued between Farrow and Allen over Ronan and the two other children they had adopted together, during which she accused him of abusing their daughter Dylan, who was then seven.

Speaking to Vanity Fair, Farrow said she and Sinatra, who died in 1998, “never really split up”. Even though he would have been 78 at the time of Ronan’s conception, she did not dismiss the possibility he was his father.

The paternity issue aside, the magazine article makes clear that wreckage from what Allen did still lingers on today.

In her first public comments, Dylan said she refuses to say Allen’s name and that she finds her fear of him “crippling”.

Recounting the alleged abuse, Dylan said: “There’s a lot I don’t remember, but what happened in the attic I remember. I remember what I was wearing and what I wasn’t wearing.

“The things making me uncomfortable were making me think I was a bad kid, because I didn’t want to do what my elder told me to do.

“I was cracking. I had to say something. I was seven. I was doing it because I was scared. I wanted it to stop.”

The fallout from the affair affected Allen’s reputation for many years. Allen, 77, and Soon-Yi Previn married in 1997 and adopted two girls together, now teenagers.

Last year Ronan sent out a Tweet which read: “Happy Father’s Day – or, as they say in my family, Happy Brother-In-Law’s Day.”

Farrow’s son Fletcher Previn also revealed he has Photoshopped Allen out of every single family photograph and edited him out of videos.

He said: “We can look at them and be reminded of the good and not be reminded of the bad.”

He also blamed Allen for the early death at 35 of Lark Previn, his sister. Fletcher said: “There were casualties, who were totally derailed.

“I really do think he’s (Allen) got some blood on his hands.”

Farrow, 68, has in recent years become an activist and works with Unicef to raise awareness of charity work in Sudan and Chad.

In a Tweet last night Ronan appeared somewhat sceptical about her claim and wrote: “Listen, we’re all possibly Frank Sinatra’s son.”

Allen’s lawyer said he denies the allegations of sexual abuse in the Vanity Fair piece.