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 the filmmaker, let loose Sunday, 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 because the filmmaker dated, and later married, Soon-Yi Previn, Mia’s adopted daughter, Ronan’s step-sister.

“He’s my father married to my sister. That makes me his son and his brother-in-law. That is such a moral transgression,” Ronan has been quoted in the past as saying.

Soon-Yi has said she never considered Woody her father or even a father figure, noting that Andre Previn, Mia’s former husband, was her adoptive father.

Ronan is currently serving as Special Adviser to the Secretary of State for Global Youth Issues and director of the State Department’s Global Youth Issues office.