Frank Sinatra underwent a vasectomy so could not have fathered Ronan Farrow, according to his youngest daughter, Tina Sinatra.
Showbiz 411's Roger Friedman said that the 66-year-old laughed when he asked her if Mia Farrow's son Ronan was her brother.
He said that Tina, who is the daughter of Sinatra and his first wife Nancy, told him: 'Couldn't be. Frank had a vasectomy before that. I don't know whose son Ronan is.'