Question: Were Max Marcin and Lionel Barrymore both polish?

Context articles: Silence (1931 film)
Lionel Barrymore on stage, screen and radio
A Family Affair (1937 film)
King of the Jungle (1933 film)
Here Comes the Bride (1919 film)
Lionel Barrymore
The Strange Case of Clara Deane
Max Marcin
The Lawyer's Secret
Marcin Mroczek

Silence is a 1931 American Pre-Code crime film directed by Louis J. Gasnier and Max Marcin and written by Max Marcin.
 The film stars Clive Brook, Marjorie Rambeau, Peggy Shannon, Charles Starrett, Willard Robertson, John Wray and Frank Sheridan.
 It was released on August 29, 1931, by Paramount Pictures.
Lionel Barrymore (born Lionel Herbert Blythe; 1878–1954) was an American actor of stage, screen and radio.
 He also directed several films, wrote scripts, created etchings, sketches and composed music.
 He was the eldest child of the actors Maurice Barrymore and Georgie Drew Barrymore, and his two siblings were John and Ethel; these and other family members were part of an acting dynasty.
 Reluctant to follow his parents' career, Barrymore appeared together with his grandmother Louisa Lane Drew in a stage production of "The Rivals" at the age of 15.
 He soon found success on stage in character roles.
 Although he took a break from acting in 1906–09 to train in Paris as a painter, he was not successful as an artist and returned to the US and acting.
 He also joined his family troupe, from 1910, in their vaudeville act.
A Family Affair is a 1937 American comedy film and the first entry in the sixteen Andy Hardy film series, though Mickey Rooney has a secondary role as the son of Judge Hardy, played by Lionel Barrymore.
 Lewis Stone and Fay Holden replaced Lionel Barrymore and Spring Byington as Judge and Mrs. Hardy in the subsequent films of the series.
King of the Jungle is a 1933 American Pre-Code adventure film directed by H. Bruce Humberstone and Max Marcin and written by Charles Thurley Stoneham, Max Marcin, Fred Niblo, Jr. and Philip Wylie.
 The film stars Buster Crabbe, Frances Dee, Sidney Toler, Nydia Westman, Robert Barrat, Irving Pichel and Douglass Dumbrille.
 The film was released on March 10, 1933, by Paramount Pictures.
Here Comes the Bride is a lost 1919 American silent comedy film produced by Famous Players-Lasky and released by Paramount Pictures.
 This film is based on the 1917 Broadway play "Here Comes the Bride" by Max Marcin and Roy Atwell.
 The film was directed by John S. Robertson and stars John Barrymore.
Lionel Barrymore (born Lionel Herbert Blythe; April 28, 1878 – November 15, 1954) was an American actor of stage, screen and radio as well as a film director.
 He won an Academy Award for Best Actor for his performance in "A Free Soul" (1931), and remains best known to modern audiences for the role of the villainous Mr. Potter character in Frank Capra's 1946 film "It's a Wonderful Life".
 He is also particularly remembered as Ebenezer Scrooge in annual broadcasts of "A Christmas Carol" during his last two decades.
 He is also known for playing Dr. Leonard Gillespie in MGM's nine Dr. Kildare films, a role he reprised in a further six films focussing solely on Gillespie and in a radio series entitled "The Story of Dr. Kildare".
 He was a member of the theatrical Barrymore family.
The Strange Case of Clara Deane is a 1932 American Pre-Code drama film directed by Louis J. Gasnier and Max Marcin and written by Max Marcin.
 The film stars Wynne Gibson, Pat O'Brien, Dudley Digges, Frances Dee, George Barbier, Russell Gleason and Lee Kohlmar.
 The film was released on May 6, 1932, by Paramount Pictures.
Max Marcin (5 May 1879 – 30 March 1948) was a Polish screenwriter and film director.
 He wrote for 47 films between 1916 and 1949.
 He also directed six films between 1931 and 1936.
 His stage work includes "See My Lawyer" (1915), directed by Frank M. Stammers; he wrote and/or produced almost 20 plays for Broadway from 1916-38.
 Marcin wrote for and produced "The FBI in Peace and War" and created, produced and wrote for the "Crime Doctor" radio program, which became the basis for a series of 10 "Crime Doctor" films.
The Lawyer's Secret is a 1931 American Pre-Code crime film directed by Louis J. Gasnier and Max Marcin and written by Lloyd Corrigan, James Hilary Finn and Max Marcin.
 The film stars Clive Brook, Charles 'Buddy' Rogers, Richard Arlen, Fay Wray, Jean Arthur, Francis McDonald and Harold Goodwin.
 The film was released on June 6, 1931, by Paramount Pictures.
Marcin Mroczek was born on 18 July 1982 in Siedlce, Poland.
 He has a twin brother Rafał who is 7 minutes older.
 At the age of 10, Marcin joined the Modern Dance Team “Caro Dance” in Siedlce.
 Together with this team, he won multiple Polish and European championships.
 He says that this was an amazing time in his life: for the very first time, he entered the stage and could meet his audience!
 When he was 18, Marcin and his brother Rafał won the casting for roles of twin brothers in the most popular Polish TV series - "M jak Miłość".
 One third of Poland followed the fate of the heroes on weekdays.
 This success has given Marcin the possibility to appear in numerous programs and television shows.
 Currently Marcin plays a role in the very popular TV series “L as Love”.
 Moreover, he started the company “Mroczek House”.