Question: Nina Auchinocloss Straight is the sister of which American writer?

Context paragraphs:
Benjamin DeMott: Benjamin Haile DeMott (June 2, 1924, Rockville Centre, New York – September 29, 2005) was an American writer, scholar, and cultural critic.  The author of more than a dozen books, DeMott was best known for his cultural criticism in popular magazines and a trilogy, "The Imperial Middle: Why Americans Can't Think Straight about Class" (1990), "The Trouble with Friendship: Why Americans Can't Think Straight about Race" (1995), and "Killer Woman Blues: Why Americans Can't Think Straight about Gender" (2000).

Nina Burleigh: Nina D. Burleigh (born 26 March 1960) is the author of five books, including "Mirage: Napoleon's Scientists and the Unveiling of Egypt" (2007), about the scholars who accompanied Napoleon's invasion of Egypt in 1798; "Unholy Business" (2008), chronicling a Biblical archaeological forgery case and the Jerusalem relic trade.  Her investigative journalism includes "The Fatal Gift of Beauty" (2011), on the wrongful imprisonment of American student Amanda Knox.  is an American writer and journalist.  An adjunct professor at Columbia Graduate School of Journalism, Burliegh is strongly sympathetic to secular liberalism, and known for her interest in issues of women's rights.  She wrote a column for "The New York Observer" called "The Bombshell".  As of January 2015 she writes for Newsweek as a National Politics Correspondent.

Nina Larrey Duryea: Nina Larrey Duryea (August 11, 1874 — November 1, 1951) was an American writer, decorated for her relief work during World War I.

Nina Romberg: Nina Romberg has been an American writer since 1978.  She wrote romance novels and Indian stories under the pseudonym Jane Archer and dark fantasy/horror fiction under Nina Romberg.

Nina Auchincloss Straight: Nina Gore Straight (née Auchincloss, formerly Steed, born 1935) is an American author, journalist, and socialite.  She is the mother of writer/director Burr Steers and artist Hugh Auchincloss Steers, half-sister of Gore Vidal, step-sister of First Lady Jacqueline Kennedy Onassis and socialite Lee Radziwill.

Gore Vidal: Eugene Louis "Gore" Vidal ( October 3, 1925 – July 31, 2012) was an American writer and public intellectual known for his patrician manner, epigrammatic wit, and polished style of writing.

Nathan West (General Hospital): Nathan West is a fictional character from "General Hospital", an American soap opera on the ABC network, portrayed by Ryan Paevey.  Created by head writer Ron Carlivati, Nathan was introduced in late 2013 by Frank Valentini as a love interest for Maxie Jones (Kirsten Storms).  Detective Nathan comes to town to avenge his "sister" Nina (Michelle Stafford) and investigate her husband Silas Clay's (Michael Easton) involvement in her attempted murder.  Instead, Nathan discovers that his "mom" Madeline Reeves (Donna Mills) is responsible for Nina's 20 year long coma.  Later, Nathan is revealed to be the biological son of Madeline's estranged sister, Liesl Obrecht (Kathleen Gati) and half-brother to the scheming Britt Westbourne (Kelly Thiebaud).

Nina MacLaughlin: Nina MacLaughlin is an American writer.  Her memoir "Hammer Head: The Making of a Carpenter," discusses her decision to restart her career.  MacLaughlin's work has also been published in "Boston Magazine, LA Review of Books","Cosmopolitan", "The Huffington Post", "The Daily Beast" and "The Boston Globe."  She was also recognized in Refiner29's list of "21 New Authors You Need to Know."

Jonathan Fernandez: Jonathan Fernandez is an American writer and producer.  He wrote the film "Rob The Mob" starring Michael Pitt, Nina Arianda, Andy Garcia, Ray Romano, and directed by Raymond DeFellitta based on the true-life story of Thomas Uva and Rose Marie De Toma

Elizabeth Wooster Stuart Phelps: Elizabeth Wooster Stuart Phelps (1815–1852) was an American writer of religiously themed articles, adult domestic fiction and books for children.  She wrote eleven books as well as numerous articles and stories that were translated and published in many languages, and probably many more works that appeared anonymously.  Phelps wrote "at the beginning of the transition in American women's writing from domestic sentimentality to regional realism" and was "among the earliest depicters of the New England scene, antedating the regional novels of her Andover neighbor, Harriet Beecher Stowe".  In addition to being one of the earliest known authors to have penned a fiction series specifically for girls, her writing also focused on the burdens on women in their restrictive roles as mothers and wives.  Her much anthologized 1852 semi-autobiographical short story, "The Angel Over the Right Shoulder", illustrates the repressive burdens frustrating a wife's creative ambitions and need to "cultivate her own mind and heart".  The story is notable as "one of the rare woman's fictions of this time to recognize the phenomenon of domestic schizophrenia", says literary critic Nina Baym.

Supporting paragraphs: Nina Auchincloss Straight Gore Vidal
Answer: Gore Vidal