Question: Who was one of two sisters of Eva Braun and a member of the inner social circle of Adolf Hitler's home at Berghof?

Context paragraphs:
The Death of Adolf Hitler: The Death of Adolf Hitler is a 1973 British television studio drama, an episode of ITV's "Sunday Night Theatre" series.  It stars Frank Finlay as Adolf Hitler and Caroline Mortimer as Eva Braun.  First transmitted on 7 January 1973, the drama details the last 10 days of Hitler's life as World War II comes to an end and Allied troops are closing in on the "Führerbunker".  Michael Sheard (who played Himmler) and Tony Steedman (who played Gen. Jodl) would play the same roles in the U.S. television film "The Bunker" in 1981.  The play depicts Hitler as a tragic antihero tormented by both the past and present, unable to reconcile his hopes and dreams with the reality of the nightmare of his own making.

Gretl Braun: Margarete Berta "Gretl" Braun (31 August 1915 – 10 October 1987) was one of the two sisters of Eva Braun.  She was a member of the inner social circle of Adolf Hitler at the Berghof.  Braun married SS-Gruppenführer Hermann Fegelein, a liaison officer on Hitler's staff, on 3 June 1944.  Fegelein was shot for desertion in the closing days of World War II.  Gretl became the sister-in-law of the Nazi dictator following his marriage to Eva, less than 40 hours before the couple killed themselves together.

Last will and testament of Adolf Hitler: The last will and testament of Adolf Hitler was prompted by Hitler receiving a telegram from "Reichsmarschall" Hermann Göring asking for confirmation of Göring's succession, combined with news of Heinrich Himmler's attempted negotiations of surrender with the western Allies, and reports that Red Army troops were within a block or two of the Reich Chancellery.  It was dictated by Adolf Hitler to his secretary Traudl Junge in his Berlin "Führerbunker" on 29 April 1945, the day he and Eva Braun married.  They committed suicide the following day, 30 April, two days before the surrender of Berlin to the Soviets on 2 May, and just over a week before the end of World War II in Europe on 8 May.  It consisted of two separate documents, a will and a political testament.

Ilse Braun: Ilse Braun (1909 – 1979) was one of two sisters of Eva Braun.  Born in Munich, Ilse was the oldest daughter of school teacher Friedrich "Fritz" Braun and seamstress Franziska "Fanny" Kronberger.  She became the sister-in-law of Nazi dictator Adolf Hitler following his marriage to Eva on 29 April 1945, less than 48 hours before the couple committed suicide together on 30 April 1945.

Berghof (residence): The Berghof was Adolf Hitler's home in the Obersalzberg of the Bavarian Alps near Berchtesgaden, Bavaria, Germany.  Other than the Wolfsschanze ("Wolf's Lair"), his headquarters in East Prussia for the invasion of the Soviet Union, Hitler spent more time at the Berghof than anywhere else during World War II.  It was also one of the most widely known of his headquarters, which were located throughout Europe.

Erich Kempka: SS-"Obersturmbannführer" Erich Kempka (16 September 1910 – 24 January 1975) was a member of the SS in Nazi Germany who served as Adolf Hitler's primary chauffeur from 1934 to April, 1945.  He was present in the area of the Reich Chancellery on 30 April 1945, when Hitler shot himself in the "Führerbunker".  Kempka delivered the gasoline to the garden behind the Reich Chancellery where the remains of Hitler and Eva Braun were burned.

Dear Friend Hitler: Dear Friend Hitler (Hindi: प्रिय मित्र हिटलर ), released in India as Gandhi to Hitler, is a multilingual Indian drama film based on the movie " Der Untergang" or " The Downfall" letters written by Mohandas Gandhi to the leader of the Nazi Party and Chancellor of Germany Adolf Hitler.  The film, starring Raghubir Yadav as Adolf Hitler and Neha Dhupia as Eva Braun, was directed by Rakesh Ranjan Kumar and produced by Anil Kumar Sharma under the production house Amrapali media vision.  It was screened at the 61st Berlin International Film Festival where it received negative reviews.  "Film Business Asia" quoted that "despite the provocative title, the film is not a tribute to the murderous Führer".  It premiered in India on 29 July 2011.

Conspiracy theories about Adolf Hitler's death: Conspiracy theories about Adolf Hitler's death contradict the fact that Adolf Hitler committed suicide in his "Führerbunker" on 30 April 1945.  Most of these theories hold that Hitler and his wife, Eva Braun, survived and escaped the city of Berlin.  While subject to some exposure in popular culture, examples being books such as "Grey Wolf: The Escape of Adolf Hitler", these viewpoints are regarded by mainstream historians as disproven fringe theories.

Eva Braun: Eva Anna Paula Hitler ("née" Braun; 6 February 1912 – 30 April 1945) was the longtime companion of Adolf Hitler and, for fewer than 40 hours, his wife.  Braun met Hitler in Munich when she was a 17-year-old assistant and model for his personal photographer; she began seeing him often about two years later.  She attempted suicide twice during their early relationship.  By 1936, she was a part of his household at the Berghof near Berchtesgaden and lived a sheltered life throughout World War II.  Braun was a photographer, and many of the surviving colour photographs and films of Hitler were taken by her.  She was a key figure within Hitler's inner social circle, but did not attend public events with him until mid-1944, when her sister Gretl married Hermann Fegelein, the SS liaison officer on his staff.

Hitler (1962 film): Hitler (1962) is a black and white American film (that was later re-released with the title, "Women of Nazi Germany").  The film stars Richard Basehart in the title role of Adolf Hitler.  Cordula Trantow stars as Geli Raubal and Maria Emo as Eva Braun.  John Banner stars as Gregor Strasser.  The film depicts Hitler through the years, beginning with the Beer Hall Putsch of November 1923 and focuses mainly on his private life, in particular, his relationships with niece Geli and longtime companion/wife, Eva Braun.  According to film critic and historian Leonard Maltin, Basehart "gives a cerebral interpretation" of Hitler during the timeframe he was the leader of Nazi Germany.  For her performance, Cordula Trantow was nominated for a 1962 Golden Globe in the category: Most Promising Newcomer - Female.  The film was produced by Three Crown Productions, Inc. and distributed by Allied Artists Pictures.

Supporting paragraphs: Gretl Braun Berghof (residence)
Answer: Margarete Berta "Gretl" Braun