In 1970, Mia Farrow married the conductor/composer André Previn.
Farrow and Previn had three biological children (twins Matthew and Sascha, and Fletcher). In 1973 and 1976, respectively, they adopted Vietnamese infants Lark Song and Summer "Daisy" Song, followed by the adoption of Soon-Yi (born c. October 8, 1972) from Korea around 1978. André and Mia divorced in 1979.
In 1980, Farrow began seeing film director Woody Allen. Farrow and Allen never married and kept separate homes, and Allen did not adopt any of Farrow's children.
Farrow and Allen parted in 1992 after Farrow discovered a sexual relationship between Allen and Soon-Yi, she discovered nude photographs that Allen had taken of Soon-Yi, who was around 20 years old then.
In a 2005 Vanity Fair interview, Allen estimated that, despite the scandal's damage to his reputation, Farrow's discovery of Allen's attraction to Soon-Yi Previn by finding nude photographs of her was "just one of the fortuitous events, one of the great pieces of luck in my life. . . It was a turning point for the better." Of his relationship with Farrow, he said, "I'm sure there are things that I might have done differently. . . Probably in retrospect I should have bowed out of that relationship much earlier than I did." In a June 22, 2011 report, Reuters quoted Allen as saying, "What was the scandal? I fell in love with this girl, married her. We have been married for almost 15 years now. There was no scandal, but people refer to it all the time as a scandal and I kind of like that in a way because when I go I would like to say I had one real juicy scandal in my life."
After ending his relationship with Mia Farrow in 1992, Allen continued his relationship with Soon-Yi Previn. Though Allen never married Mia Farrow and was not Previn's legal stepfather, the relationship between Allen and Previn has often been referred to as a stepfather involved romantically with his stepdaughter because she was adopted and legally Farrow's daughter and Allen's son's sister.
In 1991, when the relationship began, Allen was 56 and Previn around 19. Asked whether their age difference was conducive to "a healthy, equal relationship," Allen said equality is not necessarily a requirement in a relationship and "The heart wants what it wants. There's no logic to those things. You meet someone and you fall in love, and that's that." The couple married in 1997.
Previn and Allen have two adopted daughters, Bechet Dumaine (born c. 1999, China) and Manzie Tio (born 2000, Texas).