Question: Barbara Bush has a sister who is an editor-at-large for what magazine?
Context: Marvin Pierce Bush (born October 22, 1956) is the youngest son of former U.S. President George H. W. Bush and First Lady Barbara Bush (née Pierce), and brother of President George W. Bush, Jeb, Neil and Dorothy. Arnold Isaacs (May 8, 1930 – August 3, 2015), known as Arnold Scaasi, was a Canadian fashion designer who has created gowns for First Ladies Mamie Eisenhower, Barbara Bush, Hillary Clinton, and Laura Bush, in addition to such notable personalities as Joan Crawford, Ivana Trump, Princess Yasmin Aga Khan, Lauren Bacall, Diahann Carroll, Elizabeth Taylor, Catherine Deneuve, Brooke Astor, Arlene Francis, and Mary Tyler Moore. Neil Mallon Pierce Bush (born January 22, 1955) is an American businessman and investor.  He is the fourth of six children of former President George H. W. Bush and Barbara Bush (née Pierce).  His five siblings are George W. Bush, the 43rd President of the United States; Jeb Bush, a former governor of Florida; Robin Bush, who died of leukemia at the age of three; Marvin; and Dorothy.  Neil Bush is currently a businessman based in Texas. Barbara Pierce Bush Jr. (born November 25, 1981) is the elder of the fraternal twin daughters (the other is Jenna Bush Hager) of the 43rd U.S. President George W. Bush and former First Lady Laura Bush.  She is also a granddaughter of the 41st U.S. President George H. W. Bush, and his wife, Barbara Bush, after whom she was named. Barbara Tyson (born October 1, 1964) is a Canadian actress known for appearing in hit TV series "Neon Rider", "Cold Squad", "ER" and "The Twilight Zone".  One of her first notable television roles was in "Another World" as Dawn Rollo, the first HIV-positive character to be introduced in a daytime soap opera in the United States.  She was credited as Barbara Bush in her early roles. Dorothy Walker Bush Koch, often called "Doro", (born August 18, 1959) is an American author and philanthropist.  She is the daughter of the 41st President of the United States George H. W. Bush and former First Lady Barbara Bush, and the youngest and only still-living female sibling of George W. Bush, the 43rd President. Barbara Bush (née Pierce; born June 8, 1925) is the wife of George H. W. Bush, the 41st President of the United States, and served as First Lady of the United States from 1989 to 1993.  She is the mother of George W. Bush, the 43rd President, and Jeb Bush, the 43rd Governor of Florida.  She served as the Second Lady of the United States from 1981 to 1989. The White House Doctor: My Patients Were Presidents – A Memoir is a book authored by Connie Mariano, the first military woman in the history of the United States to be appointed as Physician to the President, the first female director of the medical unit of the White House, and the first Filipino-American to become a rear admiral in the US Navy.  With a foreword from Bill Clinton, the autobiographical book takes a look at the personal lives of three American Presidents (George H.W. Bush, Bill Clinton, and George W. Bush) and three American First Ladies (Barbara Bush, Hillary Clinton, and Laura Bush) she had taken care of while working as a White House physician.  It was described as a "fascinating look into what goes on behind closed doors at 1600 Pennsylvania Avenue". Barbara Bush is the wife of former U.S. President George H. W. Bush and the mother of former President George W. Bush. Jenna Bush Hager (born November 25, 1981) is an American teacher, author, and journalist.  She is the younger of the fraternal twin daughters of the 43rd U.S. President George W. Bush and former First Lady Laura Bush, and a granddaughter of the 41st U.S. President George H. W. Bush and former First Lady Barbara Bush.  She and her sister Barbara were the first twin children of a U.S. president.  Hager is an author, an editor-at-large for "Southern Living" magazine, and correspondent for NBC News.
Answer: Southern Living