Step 1 : Introduction to the question "Who is the only Oscar winner whose parents were also both Oscar winners?"
Liza Minnelli is the daughter of Judy Garland and Vincente Minnelli. Liza Minnelli is the only Oscar winner to have had both parents win Oscars. Her mother, Judy Garland was awarded the short-lived Academy Juvenile Award for her performances in The Wizard of Oz and Babes in Arms. Liza Minnelli's father, Vincent Minnelli, won the Best Director Academy Award for the film Gigi. Liza Minnelli herself won an Academy Award in 1973 for her role in Cabaret. Minnelli is one of only 16 people to win an Emmy, Grammy, Tony Award, and Academy Award.