(ABC NEWS) Father’s Day might always be a tricky holiday for Woody Allen but this year was particularly awkward.  Ronan Farrow, the 24-year-old son of Mia Farrow and Woody Allen,  let loose yesterday tweeting,  “Happy father’s day — or as they call it in my family, happy brother-in-law’s day.”

Mia Farrow even got in on the act, re-tweeting his message and adding her own comment: “BOOM.”

Woody and Ronan have been estranged for years since his parents split and because Woody was dating  (and later married) Soon-Yi Previn, Mia’s adopted daughter,  Ronan’s step-sister.  He has been quoted in the past as saying,  “He’s my father married to my sister. That makes me his son and his brother-in-law. That is such a moral transgression.”

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