Question: Did Lloyd Corrigan or Percy Adlon begin working in films first?

Context articles: Lillian Elliott
Dude Ranch (film)
Younger and Younger
Percy Adlon
Salmonberries
He Learned About Women
Mahler on the Couch
Rosalie Goes Shopping
Céleste (film)
Lloyd Corrigan

Lillian Elliott (24 April 1874 – 15 January 1959) was a stage and film actress, appearing in 60 films between 1915 and 1943.
 She was born in Canada and died in Hollywood, California.
 She was married to actor James Corrigan, and their son, Lloyd Corrigan, became a Hollywood writer, director, and character actor.
Dude Ranch is a 1931 American Western film directed by Frank Tuttle and written by Milton Krims, Percy Heath, Grover Jones and Lloyd Corrigan.
 The film stars Jack Oakie, Stuart Erwin, Eugene Pallette, Mitzi Green, June Collyer, Charles Sellon and Cecil Weston.
 The film was released on May 16, 1931, by Paramount Pictures.
Younger And Younger is 1993 American comedy film directed by Percy Adlon.
Paul Rudolf Parsifal "Percy" Adlon (] ; born 1 June 1935) is a German director, screenwriter, and producer.
 He is best known for his film "Bagdad Café".
 He is associated with the New German Cinema movement, whose "members" also include Werner Herzog and the illustrious Rainer Werner Fassbinder.
Salmonberries is a 1991 drama film directed by Percy Adlon and written by Adlon and his son Felix.
 It stars k.d. lang as Kotzebue, a young woman of androgynous appearance who works as a (male) miner in Alaska, and Rosel Zech as Roswitha, an East German immigrant and librarian.
 The film takes place in Kotzebue, Alaska and Berlin, Germany, shortly after reunification; the dialog is mostly English but includes some German with English subtitles.
He Learned About Women is a 1932 American Pre-Code comedy film directed by Lloyd Corrigan and written by Lloyd Corrigan, Ray Harris and Harlan Thompson.
 The film stars Stuart Erwin, Susan Fleming, Alison Skipworth, Gordon Westcott, Grant Mitchell and Sidney Toler.
 The film was released on November 4, 1932, by Paramount Pictures.
Mahler on the Couch (German: Mahler auf der Couch ) is a 2010 German film directed by Percy Adlon and Felix Adlon.
 It is an historical drama depicting an affair between Alma Mahler and Walter Gropius, and the subsequent psychoanalysis of Mahler's husband Gustav Mahler by Sigmund Freud.
Rosalie Goes Shopping is a 1989 English-language German film directed by Percy Adlon and starring Marianne Sägebrecht, Brad Davis, and Judge Reinhold.
Céleste is a 1982 German film by Percy Adlon about the life of the French writer Marcel Proust as he lay in his bed from 1912 to 1922; the story is told through the eyes of his real life maid, Céleste Albaret.
 She waited decades before writing her own book about the experience which was adapted for the screen by Percy Adlon.
Lloyd Corrigan (October 16, 1900 – November 5, 1969) was an American film and television actor, producer, screenwriter, and director who began working in films in the 1920s.
 The son of actress Lillian Elliott, Corrigan directed films, usually mysteries such as "Daughter of the Dragon" starring Anna May Wong (one of a trilogy of Fu Manchu movies for which he has writing credits), before dedicating himself more to acting in 1938.
 His short "La Cucaracha" won an Academy Award in 1935.