Question: In what year was the mother of Manon Gropius born?

Context articles: Ati Gropius Johansen
List of EastEnders characters (2015)
Alma Mahler
Jane McKechnie Walton
Kweku Elliot
Henry Hill (architect)
Early life of Habib Bourguiba
Manon Gropius
In Memory Of ... (ballet)
Barbara Carrasco

Ati Gropius Johansen (1926 - September 7, 2014) was a graphic designer and teacher.
 She was the daughter of famous architect and Bauhaus founder Walter Gropius and his second wife Ilse (Ise) Frank.
 Johansen was born as Beate in Wiesbaden, Germany, and was adopted by Walter and Ise at 9 years old when her mother, Ise's sister, died.
 Johansen was instrumental in continuing the legacy of her father through her teaching.
The following is a list of characters that first appeared in the BBC soap opera "EastEnders" in 2015, by order of first appearance.
 All characters were introduced by the show's executive producer Dominic Treadwell-Collins.
 January saw the arrival of the year's first baby, Matthew Mitchell Cotton, son of Ronnie Mitchell and Charlie Cotton.
 The following month saw the show celebrate its 30th anniversary with a live week, which oversaw the live arrivals of Vincent Hubbard, and the second baby born in 2015, Pearl Fox-Hubbard, Vincent's daughter with Kim Fox-Hubbard.
 In March, Claudette Hubbard arrived as Donna Yates' foster mother and an acquaintance of Les Coker followed by Stan Carter's friend Cyril Bishop and Sharon Mitchell's aunt Margaret Midhurst, whilst Denise van Outen joined in April as Karin Smart.
 May saw the arrivals of June Whitfield as Sister Ruth, Mick and Linda Carter's son Ollie Carter, the year's third baby, Mo Harris' business associate Fat Elvis and Kush Kazemi's mother, Carmel.
 Paul Coker, the grandson of Les and Pam Coker, was introduced in June, as was Jade Green, the long-lost daughter of Shabnam Masood and Dean Wicks.
 After Kathy Sullivan's surprise return during the 30th anniversary in February, her husband Gavin Sullivan made his debut in August.
 September saw the arrivals of Max Branning's prosecution lawyer Hazel Warren and Louie Beale, the baby son of Lauren Branning and Peter Beale.
 In October, Elaine Peacock's toyboy lover Jason Adams was introduced, as well as first transgender character to be played by a transgender actor, Kyle Slater.
 December saw the birth of the year's fifth baby, Kush and Stacey Slater's son, Arthur Fowler.
Alma Maria Mahler Gropius Werfel (born Alma Margaretha Maria Schindler; 31 August 1879 – 11 December 1964) was a Viennese-born composer.
 author, editor and socialite.
 She became the wife, successively, of composer Gustav Mahler, architect Walter Gropius, and novelist Franz Werfel, as well as the consort of several other prominent men, notably painter Oskar Kokoschka.
 Musically active from her early years, she was the composer of at least seventeen songs for voice and piano.
 In later years her salon became part of the artistic scene, first in Vienna, then in Los Angeles and in New York.
Jane McKechnie Walton was born on July 16, 1847 in Edinburgh, Scotland.
 She was the daughter of Jane (Jean Tinto) Bee and John McKechnie.
 Her father was a bell molder by trade and died of typhoid on January 3, 1848 when Jane was just eighteen months old.
 Her grieving mother gave birth to the McKechnie's only son a few months later.
 Within another year, Jane's mother was taught about The Church of Jesus Christ of Latter-day Saints (LDS Church) by two Mormon missionaries.
 She believed their words and was baptized into the LDS Church on February 21, 1850.
 Several months later, Jane's grandmother, uncle and aunt followed her mother, Jean's footsteps and also joined the newfound religion.
 By September 1850, Jane's mother, grandmother, uncle, aunt and her own brother and sister were booked for ocean travel on The North Atlantic ship which was bound for New Orleans in America.
Born to a Ghanaian father and Trinidadian mother, Kweku Elliot is of mixed heritage.
 His father Kojo Elliot was a lawyer, and his mother Henrietta Elliot a school teacher.
 Elliot was born in Takoradi, Ghana's Western Region.
 His family moved to Accra when he was 5 years old, a year later his father Kojo Elliot died.
 He attended SOS Herman Gmeiner International School with his elder sister Essie, the same school in which his mother had also taught.
 During his high school years he attended Akosombo International School, and later switched to Mfantsipim School.
 In his late teens Elliot moved to The United Kingdom and attended Arts University Bournemouth, during his stay in the UK he has stated in interviews that he worked as a model, and did the odd job here and there in order to make ends meet.
Henry Hill (1913–1984) was born in England to American parents.
 His mother was Anita Jeffress-Hill.
 His mother and her children moved back to the US and settled in Berkeley near the Claremont hotel.
 He studied architecture at the University of California, Berkeley graduating in 1936 and at Harvard's Graduate School of Design, where he worked under the renowned Walter Gropius.
 After earning his master's degree in architecture in 1938, he returned to the Bay Area, joining the office of John Ekin Dinwiddie in San Francisco and making partner in 1939.
 During World War II Hill served as a captain in the U.S. Army Corps of Engineers.
 When the war ended, he rejoined Dinwiddie and a new partner, Erich Mendelsohn, a well-known German architect who had fled the Third Reich.
Habib Bourguiba was officially born on August 3, 1903, in Monastir to Ali Bourguiba (1850–1925) and Fattouma Khefacha (1861–1913).
 Being their eighth and last child, his birth was a shame to his mother and a worry to his father, who conceived him in an advanced age.
 Born into a modest family, the young Habib was raised in a female environment and was marked by gender inequality.
 Despite his financial conditions, Ali Bourguiba decided to invest his money in the education of his son and therefore, avoid him his fate of being enrolled in the army.
 Likewise, he sent his son to Tunis, circa 1907, to live with his brother M'hamed, in order to study in elementary school of Sadiki.
 Separated from his mother at 5, he lived in modest conditions in the capital city, and the Jellaz Affair made a deep impression on him.
 In 1913, he obtained his Certificat d'études primaires to the relief of his father, exempting him from military service and permitted him to pursue his secondary education in Sadiki.
 However, in the same year, he lost his mother at the age of 10, which marked his entire life.
Alma Manon Gropius (October 5, 1916 – April 22, 1935) was the daughter of the architect Walter Gropius and the composer and diarist Alma Mahler and the stepdaughter of the novelist and poet Franz Werfel.
 She is a "Randfigur" (peripheral person) whose importance lies in her key relationships to major figures: a muse who inspired the composer Alban Berg as well as Werfel and the Nobel Prize-winning writer Elias Canetti.
 Manon Gropius is most often cited as the "angel" and dedicatee of Berg's Violin Concerto (1935).
In Memory of ... is a ballet in one act made by New York City Ballet ballet master Jerome Robbins to Berg's "Violin Concerto (to the Memory of an Angel)" of 1935 (written on the death of Manon Gropius, daughter of Alma Mahler, Gustav Mahler's widow, and Walter Gropius), based on themes from Mahler, a Carpathian folk song, and Bach's "O Ewigkeit, du Donnerwort", BWV 20.
 The premiere took place on 13 June 1985 at the New York State Theater, Lincoln Center, with scenery by David Mitchell, costumes by Dain Marcus and lighting by Jennifer Tipton.
Carrasco was born in El Paso, Texas to Mexican-American parents.
 She was the second-oldest child and oldest girl in her family.
 She had two brothers and two sisters growing up.
 When she was around a year or so of age, her family moved to Los Angeles.
 They lived in government Veteran's housing in Culver City since her father was a Korean War Navy veteran.
 She recalls that they were poor and lived off of food stamps.
 Carrasco's childhood growing up in the predominantly Mexican-American and African-American community of Mar Vista Gardens was sometimes painful, because she was teased for having lighter skin than her peers and stood out for her green eyes; being called "white girl," "green eyes" and ""güera"."
 Her experiences with being simultaneously perceived as not truly Mexican-American and being told to "take advantage of being light skinned" makes up of part of her artistic subject matter later on in life.
 Carrasco said that her father encouraged her to broaden her horizons, go to college and encouraged her artwork.
 He had appreciated art and he was considered artistic.
 Her father, who worked as a bus driver for Santa Monica Bus Lines said that "anybody could be a bus driver but not everybody could be an artist."
 Carrasco's father died of a heart attack when she was twelve and it was difficult for her because she was always close to her father.
 Carrasco's mother, who also volunteered as a Girl Scout leader, was also artistically inclined.
 Her mother admired Japanese art and decorated the house with it.
 Carrasco felt that growing up with Japanese images influenced her sense of line.
 She also felt that her mother was a personal role model because she was a strong woman.
 Her mother was also, however, very protective of her girls, and she expected Carrasco to act as a role model of traditional femininity for her sisters.