Moses Farrow, now 39, has maintained a low profile amid the accusations surrounding his father, and the publicity caused by the work of his brother Ronan, a crusading journalist who will soon be presented with his Pulitzer Prize for reporting on the Harvey Weinstein scandal.
An adopted son of Woody Allen and Mia Farrow has sprung to his father’s defence, insisting Allen never molested his sister.
But, describing himself as “a very private person”, Mr Farrow published a 4,650-word blog post on Wednesday in an attempt to tell his version of events.
“Given the incredibly inaccurate and misleading attacks on my father, Woody Allen, I feel that I can no longer stay silent as he continues to be condemned for a crime he did not commit,” he wrote.
“I was present for everything that transpired in our house before, during, and after the alleged event. Now that the public hysteria of earlier this year has died down a little and I have some hope that the truth can get a fair hearing, I want to share my story.”
Allen was accused by his daughter Dylan in 2014 of sexually assaulting her when she was seven. She is supported by her brother Ronan and mother, and the accusations have gathered increased attention given the #MeToo scandal, and her brother’s role in it.
Moses Farrow, born in Korea in 1978, was afflicted with cerebral palsy and abandoned in a telephone booth, to be adopted by Farrow when he was two.
In 1985 she then adopted Dylan; Ronan, Farrow and Allen’s only biological child was born in 1987, and in 1992 Allen became both Dylan and his adoptive parent as well.
Now a 39-year-old family therapist, Mr Farrow depicts a traumatic childhood at the family home in Connecticut, in which his mother created an atmosphere “in which I felt the constant need to gain her trust and approval.”
He accepted that Allen’s relationship with Soon-Yi, Farrow’s adopted daughter, caused immense trauma in the family.
But he insisted the real problem did not come from his film director father.
“The fatal dysfunction within my childhood home had nothing to do with Woody,” he writes. “It began long before he entered the picture and came straight from a deep and persistent darkness within the Farrow family.”
Mr Farrow noted that his grandfather, a celebrated film director, was an alcoholic and a “serial philanderer”.
Her brother John, Mr Farrow writes, is currently in prison, sentenced in 2013 to 25 years for multiple child molestation charges.
He writes: “My mother, of course, had her own darkness. She married 50-year-old Frank Sinatra when she was only 21.
“After they divorced, she moved in to live with her close friend Dory Previn and her husband André. When my mother became pregnant by André, the Previns’ marriage broke up, leading to Dory’s institutionalization.
“It was never spoken of in our home, of course, and not even known to me until a few years ago.
“But, as I look at it – as a licensed therapist as well as an eyewitness – it’s easy to see the seeds of dysfunction that would flourish within our own home.”
Mr Farrow accuses his mother of slapping him for moving a tape measure – something he insisted he did not do – and being spanked and forced to stand naked in front of his siblings as punishment for cutting the belt loops off his new jeans.
His brother Thaddeus committed suicide at the age of 27 in 2016, shooting himself in his car.
His sister Lark “wound up on a path of self-destruction”, he writes, struggled with addiction, and eventually died in poverty from AIDS-related causes in 2008 at age 35.
Another sister, Tam, died in 2000 – a death which Farrow insists was an accidental overdose by her blind daughter, but which Mr Farrow claims was suicide.
Mr Farrow insists that his sister Dylan could not have been abused by Allen in August 1992 because the other siblings were all present in the house, and watching him closely, having been warned by Farrow that he was “a monster” once his relationship with Soon-Yi became known.
He also pours scorn on Dylan’s account of being abused in the attic and lying on her back watching a model train set, insisting that there was no train set in the attic – only in the boys’ room in the garage.
He claimed that he felt under pressure to denounce Allen, writing that going along with Farrow’s wishes was “the biggest regret of my life”.
“During the custody hearing, my mother kept stressing how we needed to stick together as a family.
“Frightened and beaten down, I, too, played my part. I even wrote a letter condemning Woody, saying that he had done something horrible and unforgivable, and had broken my dreams. I even read the letter for the news media that were now regularly gathered at the end of our driveway, knowing that doing so would earn my mother’s approval.
“That public denouncement of my father remains the biggest regret of my life.”
Mr Farrow eventually reconnected with his father when he was in his late 20s, becoming estranged from his mother in the process.
His sister Dylan has previously said Mr Farrow is “dead to me”, after he spoke to People magazine in 2014.
She dismissed his recollections as “irrelevant.”
Mr Farrow also spoke to the author of a book on Allen’s films, published in October.
On Wednesday, he addressed his sister and said: “My healing began only after getting away from her. And what she has done to you is unbearable. I wish you peace, and the wisdom to understand that devoting your life to helping our mother destroy our father’s reputation is unlikely to bring you closure in any kind of lasting way.”
He said he was prepared for his mother to “launch a campaign to discredit me for speaking out,” adding: “I know it comes with the territory. And it’s a burden I am willing to bear.”
Farrow’s representatives, contacted by The Telegraph, declined to comment.