Ronan Farrow celebrates Father's Day at Woody Allen's expense Ronan Farrow certainly didn't forget dad Woody Allen on Father's Day, despite their reported decades-long estrangement. "Happy father's day - or as they call it in my family, happy brother-in-law's day," Ronan tweeted Sunday. Mom Mia Farrow got in on the fun too, retweeting Ronan's missive and adding the word, "Boom." PHOTOS: Children of celebrities Things got, well, awkward between Allen and Mia Farrow in the early '90s, after Allen started up an affair with Soon-Yi Previn, Mia's adopted daughter with Andre Previn. Woody and Mia, who were longtime romantic companions but had never married, broke up in 1992; Woody married Soon-Yi, who was never legally his stepdaughter, in 1997. Soon-Yi, now 41, and Woody, 76, who have adopted two daughters, appeared at the Los Angeles Film Festival on Thursday for the premiere of the writer-director's "To Rome With Love." Ronan - birth name Satchel - was 5 at the time of his parents' breakup. If that seems a bit young to get upset about what he has called "such a moral transgression," remember: Ronan, now 24 and a Rhodes Scholar, entered college at 11 and was accepted into Yale Law at 15, though he deferred enrollment for a few years so he could do a little work with the U.S. ambassador to the United Nations. It's all relative. No pun intended. Woody Allen and Mia Farrow's son Ronan Farrow is a Rhodes Scholar Courtney Love no longer daughter Frances Bean Cobain's legal guardian Michael Lohan owns up to 'Late Show' gaffe, Letterman 'apologizes' to Lindsay