Question: What is the name of the wife of Svend Borberg's son?

full_context: Document 1: Mann family: The Mann family is a German Hanseatic family, members of the small ruling class of the city republic of Lübeck. The family's most famous member is Nobel Prize for Literature laureate Thomas Mann, who portrayed his own family and social class in the novel "Buddenbrooks". The family became part of the commercial elite of Lübeck from the late 18th century. In 1877, Thomas Mann's father Thomas Johann Heinrich Mann was elected Senator of Lübeck (corresponding to Minister of Finance in other German states).
Document 2: Death of Gertrude Hullett: Gertrude "Bobby" Hullett (1906 – 23 July 1956), a resident of Eastbourne, East Sussex, England, was a patient of the suspected serial killer Dr John Bodkin Adams, who was charged with her murder but never tried for it. Adams was tried in 1957 for the murder of Edith Alice Morrell and the Hullett charge was meant to follow the Morrell case.
Document 3: Helmuth Buxbaum: Helmuth Buxbaum (March 19, 1939 — November 1, 2007) was a multimillionaire owner of a network of nursing homes in Ontario who was convicted in 1986 of the murder of his wife, two years previously. Hanna Buxbaum was found dead July 5, 1984 on a highway near London, Ontario after having been shot in the head three times. Helmuth Buxbaum had taken out a $1 million life insurance policy on his wife shortly before her murder. The Crown attorney prosecuting the case argued that Buxbaum had hired a hitman to kill his wife for $10,000 and had pulled over to the side of the road so that the man could drag her out of the car and shoot her. The gunman, Gary Foshay, was convicted of second degree murder. Buxbaum was convicted after a high-profile trial and sentenced to a life sentence without the possibility of parole for 25 years. He died in prison in Kingston, Ontario on November 1, 2007 at the age of 68.
Document 4: Society Murders: The Society Murders is the name given to the 4 April 2002 murders of husband and wife millionaire socialites Margaret Mary Wales-King, 69, and husband, Paul Aloysius King, 75, in Melbourne, Victoria, Australia, by Margaret's son, Matthew Wales. News media throughout Australia covered the crime and subsequent trial, which later became the subject of a book and a television film.
Document 5: Svend O. Heiberg: Svend Oluf Heiberg (1900–1965) was a silviculturalist, born in Copenhagen, Denmark, on July 22, 1900, educated at Yale University. He came to the United States in 1926, becoming a naturalized US citizen in 1934. Heiberg was Professor of Silviculture, and later Associate Dean for Graduate Studies, at the New York State College of Forestry at Syracuse University in Syracuse, New York. He and his wife, Aasa Gerlach, had two daughters, Lily and Karin, and one son, Eric. Heiberg died on February 5, 1965, in Syracuse.
Document 6: John Bodkin Adams: John Bodkin Adams (21 January 1899 – 4 July 1983) was a British general practitioner, convicted fraudster and suspected serial killer. Between 1946 and 1956, more than 160 of his patients died in suspicious circumstances. Of these, 132 left him money or items in their wills. He was tried and acquitted for the murder of one patient in 1957. Another count of murder was withdrawn by the prosecution in what was later described as "an abuse of process" by the presiding judge Patrick Devlin, causing questions to be asked in Parliament about the prosecution's handling of events. The trial was featured in headlines around the world and was described at the time as "one of the greatest murder trials of all time" and "murder trial of the century". It was also described at the time as "unique" because, in the words of the judge, "the act of murder" had "to be proved by expert evidence."
Document 7: Svend Borberg: Svend Borberg (April 8, 1888 – October 7, 1947) was a Danish author, playwright, editor and literary critic. He was the brother of N. C. Borberg and William Borberg and the father of Claus von Bülow.
Document 8: Claus von Bülow: Claus von Bülow (born Claus Cecil Borberg; 11 August 1926) is a British socialite of German and Danish ancestry. He was accused of the attempted murder of his wife Sunny von Bülow (born Martha Sharp Crawford, 1932–2008) in 1979 which had left her in a coma from which she later recovered but that conviction in the first trial was reversed and he was found not guilty at his second trial. In the same trial he was also accused of the attempted murder of his wife by administering an insulin overdose in 1980 which left her in a persistent vegetative state for the rest of her life, but that conviction in the first trial was also reversed and he was found not guilty at his second trial.
Document 9: Malcolm Webster (murderer): Malcolm John Webster (born 18 April 1959) is an Englishman convicted of the murder of his first wife in Scotland in 1994 and the attempted murder of his second wife. Both cases involved staged car crashes and were carried out for the life insurance money. A police profiler labelled him a sociopath.
Document 10: Svend Olufsen: Svend Olufsen was a Danish electrical engineer who co-founded Bang & Olufsen with . Like Bang, Olufsen studied at the Technical University of Aarhus. Olufsen and Bang both shared an enthusiasm for radio, which at the time was in its infancy.
Document 11: Victor Borge: Børge Rosenbaum (3 January 1909 – 23 December 2000), known professionally as Victor Borge ( ), was a Danish and American comedian, conductor, and pianist who achieved great popularity in radio and television in the United States and Europe. His blend of music and comedy earned him the nicknames "The Clown Prince of Denmark," "The Unmelancholy Dane," and "The Great Dane."
Document 12: Robert Durst: Robert Alan Durst (born April 12, 1943) is an American real estate heir, the son of New York City mogul Seymour Durst, and the elder brother of Douglas Durst, head of the Durst Organization. He is primarily known for being suspected of foul play against three individuals in different states: Kathleen McCormack Durst, his first wife, who disappeared in New York in 1982; Susan Berman, his longtime friend, who was murdered in California in 2000; and his neighbor, Morris Black, who was murdered in Texas in 2001. Durst was the subject of a multi-state manhunt and was ultimately convicted of dismembering Black, but acquitted of his murder.
Document 13: Björn Nyberg: Björn Emil Oscar Nyberg (11 September 1929 – 16 November 2004), was a Swedish fantasy author best known for his additions to the series of Conan stories begun by Robert E. Howard. His primary contribution to the series was "The Return of Conan" (1957), which was revised for publication by L. Sprague de Camp. He lived in France.
Document 14: Claudia Nolte: Claudia Nolte was born Claudia Wiesemüller on February 7, 1966 in Rostock, a town that then lay in East Germany. Nolte became a German politician of the Christian Democratic Union party (CDU), becoming the youngest cabinet minister in German history whilst in office from 1994–98. She was Federal Minister for family, seniors, women and youth affairs and, by virtue of this office, presided over the European Union Council of Ministers. Claudia is a Catholic and is active in the Catholic community. She is married to investigative journalist David Crawford of CORRECT!V. With her marriage in July 2008, she changed her name to Claudia Crawford.
Document 15: Börge Hellström: Börge Lennart Hellström (25 September 1957 – 17 February 2017) was a Swedish writer. A reformed criminal, he was perhaps best known as a founding member of the organisation "Kriminellas revansch i samhället" (KRIS). The organisation aims to combat crime and provide support to former criminals. He was also one half of the writing duo Roslund & Hellström. With journalist Anders Roslund, he co-authored seven books between 2004 and 2016.
ground_truth: Sunny von Bülow