Frank is not the father of Mia Farrow's son – Mrs Sinatra
Mr Farrow (25), who resembles the late Rat Pack singer and has similar blue eyes, joked on Twitter that "we're all possibly Frank Sinatra's son", but did not reject the claim.
The author of the article, Maureen Orth, added that Mia Farrow had sent her a tape of her son singing a show tune, and that "his phrasing sounds eerily familiar".
On Wednesday night, however, Barbara Sinatra told the 'Desert Sun' newspaper in California that the longstanding rumour was false. "I can't hardly believe that," she said. "It's just a bunch of junk. There's always junk written."
Mrs Sinatra, a one-time showgirl who married Frank Sinatra eight years after his divorce from Farrow in 1968, also rejected remarks about Mr Farrow made to the magazine by the singer's daughter, Nancy.
"He is a big part of us, and we are blessed to have him in our lives," she said of the human rights activist and former adviser to Hillary Clinton.
"It sounds like a phony to me," said Mrs Sinatra.
The article also revived allegations that Allen molested his and Farrow's adopted daughter, Dylan, which he has always denied. A spokesman for Allen, who is estranged from the Farrows, described the claims as "so extravagantly absurd he is not going to comment". (© Daily Telegraph, London)