Tina Sinatra , 66 , laughed when he asked if Mia Farrow son Ronan , 27 , was her brother . She said : 'Could n't be . Frank had a vasectomy before that . I do n't know whose son Ronan is ' In 2013 , Mia Farrow 's admitted that Frank Sinatra may be the father of her son , instead of Woody Allen .
Tina Sinatra , 66 , laughed when he asked if Mia Farrow 's son Ronan , 27 , was her brother . She said : 'Could n't be . Frank had a vasectomy before that . I do n't know whose son Ronan is ' In 2013 , Mia Farrow admitted that Frank Sinatra may be the father of her son , instead of Woody Allen .