Question: Who is the mother of the Shadows screenwriter?

full_context: Document 1: The Rat Race: The Rat Race is a 1960 American drama film adapted from the play of the same name by Garson Kanin. Directed by Robert Mulligan, it stars Tony Curtis and Debbie Reynolds as struggling young entertainment professionals in New York City. Filming took place in Pittsburgh, Pennsylvania. Sam Butera and Gerry Mulligan have minor roles as saxophonists.
Document 2: John Cassavetes: Cassavetes was born in New York City, the son of Greek American Katherine Cassavetes (née Demetre), who was to be featured in some of his films, and Greek immigrant Nicholas John Cassavetes; in Greek, his name is Ιωάννης Νικόλαος Κασσαβέτης. His early years were spent with his family in Greece; when he returned at age seven, he spoke no English. He was reared on Long Island, New York. He attended Port Washington High School from 1945 to 1947 and participated in "Port Weekly" (the school paper), "Red Domino" (interclass play), football, and the "Port Light" (yearbook). Next to his photo on page 55 of his 1947 yearbook is written: "'Cassy' is always ready with a wisecrack, but he does have a serious side. A 'sensational' personality. Drives his 'heap' all over." Cassavetes attended Blair Academy in New Jersey and spent a semester at Champlain College before being expelled due to his failing grades. He spent a few weeks hitchhiking down to Florida and transferred to the American Academy of Dramatic Arts after running into friends who had just enrolled, stating the school was packed with girls, encouraging Cassavetes to enroll. He graduated in 1950 and met his future wife Gena Rowlands at her audition into the Academy in 1953 and they were married four months later in 1954. He continued acting in the theater, took small parts in films and began working on television in anthology series, such as "Alcoa Theatre".
Document 3: Ines Cassettari: Ines Cassettari (died 1943) was an Italian emigrant to America whose autobiography became famous. She was born in 1866 or 1867 in Lombardy, Italy, and abandoned at birth, and lived in an orphanage and then a foster home. She was forced to marry an abusive man. They immigrated to the United States, where she refused to run a brothel for him and eventually left him. She remarried and worked as a cleaning woman in the Chicago Commons until she died.
Document 4: Aroldo Tieri: Born in Corigliano Calabro, son of the journalist and playwright Vincenzo Tieri, Aroldo Tieri moved in Rome at 18 to study law at university, and in the meanwhile approached acting and enrolled the Accademia Nazionale di Arte Drammatica Silvio D'Amico. Graduated in 1938, he almost immediately made his debut in theater and in film. Soon Tieri became one of the most popular and appreciated young actors, with a predisposition to the comic genre. In cinema Tieri specialized in roles on jealous, irascible, nervous boyfriends, and this characterization limited his career and caused his retirement from films in the late 1960s. His versatility was revealed especially on stage and on television, that at the end of the 1950s gave him notoriety with a successful adaptation of the Dickens' novel "Nicholas Nickleby" and then as host of "Canzonissima" in 1960. Companion for many years on the scene of the actress Giuliana Lojodice, later his wife, Tieri formed a stage company with her in 1965 and the couple was very active in multiple projects at theater, radio and TV.
Document 5: David Kassan: David Kassan received his B.F.A. in 1999 from the College of Visual and Performing Arts at Syracuse University, Syracuse, NY. He continued his studies at The National Academy, and the Art Students League of New York, both in Manhattan
Document 6: Gavrik Losey: Gavrik was born in New York, the son of film director Joseph Losey and fashion designer Elizabeth Hawes. He attended the Little Red SchoolHouse in Manhattan, Poughkeepsie Day School in Poughkeepsie, and high school in New Jersey. After graduating, he travelled with his blacklisted father to England where he attended University College London.
Document 7: I'm Almost Not Crazy: John Cassavetes, the Man and His Work: I'm Almost Not Crazy: John Cassavetes, the Man and His Work is a 1989 American documentary directed by Michael Ventura and starring John Cassavetes.
Document 8: John Abineri: Born in London, he attended the Old Vic drama school and described himself as "Well educated from the age of five to eighteen". He spoke a number of languages (including German, Russian and French) fluently, which led to him being cast as a number of different nationalities.
Document 9: Faces (1968 film): Faces is a 1968 drama film, written and directed by John Cassavetes, and starring John Marley, Cassavetes' wife Gena Rowlands, Fred Draper, Seymour Cassel, and Lynn Carlin. In 2011, it was added to the National Film Registry of the Library of Congress.
Document 10: Black Dynamite: Cinematographer Shawn Maurer shot "Black Dynamite" on Super 16 Color Reversal Kodak film stock to get the high contrast and saturated look common in many low-budget Blaxploitation films of the 1970s. The film was then converted to digital for editing. The filmmakers supplemented their shoot with period stock footage from Sony Pictures Stock Footage, using films such as "Missing in Action", "Charlie's Angels", and "Police Woman". "Black Dynamite" was shot in the Leimert Park and Angeles Vista sections of Los Angeles over twenty days, with several green-screen days and one reshoot day. The film had such a low budget that they had to "think in the same ways that they had to think" in the classic blaxploitation movies. Sanders and White had a difficult time keeping the modern world out of the movie. Sanders was worried about anything modern that could destroy "the whole illusion." White worked individually with actors to keep their tone correct.
Document 11: Shotgun Stories: Shotgun Stories is a 2007 drama film about a feud between two sets of half-brothers following the death of their father in rural Arkansas. The film was written and directed by Jeff Nichols, and stars Michael Shannon, Barlow Jacobs, Michael Abbott Jr. and Glenda Pannell.
Document 12: Shadows in a Conflict: Shadows in a Conflict () is a 1993 Spanish drama film directed by Mario Camus. It was entered into the 18th Moscow International Film Festival.
Document 13: James De La Vega: James De La Vega was born in East Harlem, the son of Jaime De La Vega and Elsie Matos, and graduated valedictorian at York Preparatory School and attended Cornell University, where he graduated in 1994 with a Bachelor of Fine Arts. He is a former art teacher at York Preparatory School.
Document 14: Shadows (1959 film): Shadows is a 1958 American independent drama film directed by John Cassavetes about race relations during the Beat Generation years in New York City. The film stars Ben Carruthers, Lelia Goldoni and Hugh Hurd as three African-American siblings, though only one of them is dark-skinned. The film was initially shot in 1957 and shown in 1958, but a poor reception prompted Cassavetes to rework it in 1959. Promoted as a completely improvisational film, it was intensively rehearsed in 1957, and in 1959 it was fully scripted.
Document 15: Johnny Depp: Depp was born in Owensboro, Kentucky, the youngest of four children of Betty Sue Palmer (née Wells), a waitress, and John Christopher Depp, a civil engineer.  Depp moved frequently during his childhood. He and his siblings lived in more than 20 different places, eventually settling in Miramar, Florida in 1970. Depp's parents divorced in 1978 when he was 15. His mother married Robert Palmer, whom Depp has called "an inspiration".With the gift of a guitar from his mother when he was 12, Depp began playing in various garage bands. A year after his parents' divorce, he dropped out of Miramar High School to become a rock musician. He attempted to go back to school two weeks later, but the principal told him to follow his dream of being a musician. He played with The Kids, a band that enjoyed modest local success. The Kids set out together for Los Angeles in pursuit of a record deal, changing their name to Six Gun Method, but the group split up before signing a record deal. Depp subsequently collaborated with the band Rock City Angels and co-wrote their song "Mary", which appeared on Rock City Angels' debut Geffen Records album Young Man's Blues. On December 20, 1983, Depp married Lori Anne Allison, the sister of his band's bass player and singer. During their marriage she worked as a makeup artist while he worked a variety of odd jobs, including a telemarketer for pens. His wife introduced him to actor Nicolas Cage, who advised him to pursue an acting career. Depp and Allison divorced in 1985.
ground_truth: Katherine Cassavetes
sub_queries: Shadows >> screenwriter Answer: John Cassavetes
Who is the mother of John Cassavetes ? Answer: Katherine Cassavetes