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FILE - In this Thursday, Aug. 22, 2013 file photo, former first lady Barbara Bush listens to a patient's question during a visit to the Barbara Bush Children's Hospital at Maine Medical Center in Portland, Maine. Former first lady Barbara Bush has been hospitalized in Houston with a respiratory-related issue, Tuesday, Dec. 31, 2013. A statement Tuesday night from the office of her husband, former President George H.W. Bush, said she was admitted to Houston Methodist Hospital on Monday. (AP Photo/Robert F. Bukaty, File) ( Barbara Bush Hospitalized )

In this Dec. 23, 2013 photo, former first Lady Barbara Bush left, and former President George H. W. Bush look on during a ceremony at President Bush's office in Houston. Former first lady Barbara Bush has been hospitalized in Houston with a respiratory-related issue, Tuesday, Dec. 31, 2013. A statement Tuesday night from the office of her husband, former President George H.W. Bush, said she was admitted to Houston Methodist Hospital on Monday. (AP Photo/Houston Chronicle, James Nielsen) ( Barbara Bush Hospitalized )

President Barack Obama laughs as he sits between his wife, first lady Michelle Obama and former first lady Barbara Bush after his speech during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip) ( Obama Bush Library )

Former first ladies Barbara Bush, left, and Laura Bush, take part in the Enduring Legacies of America’s First Ladies conference Thursday, Nov. 15, 2012, in Austin, Texas. Family members, former staff members, historians, and White House insiders were also spoke as part of the program. (AP Photo/David J. Phillip) ( White House Children )

Former first lady Barbara Bush, center, sits with first lady Michelle Obama, top, and Jill Biden, right, wife of Vice President Joe Biden, during a ceremony to recognize the 5,000th Daily Point of Light Award in the East Room of the White House in Washington, Monday, July 15, 2013. President Obama welcomed former President George H. W. Bush to the White House in a salute to public service and to the drive for volunteerism that the 41st president inspired with his "thousand points of light" initiative more than two decades ago. (AP Photo/Susan Walsh) ( Obama First President Bush )

In this Sept. 21, 2013 photo, former President George H.W. Bush, front left, former first lady Barbara Bush, right, pose for photos after wedding of longtime friends Helen Thorgalsen, center, and Bonnie Clement, in Kennebunkport, Maine. Bush was an official witness at the same-sex wedding, his spokesman said Wednesday, Sept. 25, 2013. (AP Photo/Susan Biddle) ( Bush Same Sex Wedding )

Former President George Bush gives thumbs up after he and his wife, Barbara Bush voted on Wednesday, Nov. 2, 1994, in Houston. The Bush's son, George W. Bush, is running for governor against Democratic incumbent Ann Richards. (AP Photo/David J. Philip) ( George Bush )

Former President Goerge H. W. Bush and former first lady Barbara Bush chat at a ceremony to unveil a new garden named in Barbara's honor, Thursday, Sept 29, 2011, in Kennebunkport, Maine. A local group donated Ganny's Garden – Barbara Bush' grandchildren call her Ganny – on the town green. It features flowers, greens and 17 trees in honor of the Bushes' 17 grandchildren. (Photo by Robert F. Bukaty) ( Bush Garden )

Barbara Bush talks with former President George H.W. Bush during the fourth inning of an MLB baseball game between the Florida Marlins and Houston Astros Friday, April 8, 2011, in Houston. (AP Photo/Dave Einsel) ( Marlins Astros Baseball )

Former President George H. W. Bush, left, joined by former First Lady Barbara Bush, center, and granddaughter, Lauren Bush, right, listen Wednesday, Sept. 30, 2009 during a ceremony to unveil a Navy anchor and plaque in honor of Bush at an turnout that overlooks Bush's Walker's Point coastal estate. The 6,000 pound anchor and plaque were given by a group of neighbors and friends to thank him for his service as president and for being a good neighbor. (AP Photo/Joel Page) ( Bush Honored )

Former Florida Gov. Jeb Bush, center, reaches to embrace his father, former President George H.W. Bush, left, who received the 2010 Medal of Freedom from President Barack Obama during a ceremony in the East Room of the White House in Washington, Tuesday, Feb. 15, 2011. At right former first lady Barbara Bush. (AP Photo/Pablo Martinez Monsivais) ( Obama Medal of Freedom )

From left, former President Bill Clinton, former President George H. W. Bush and his wife Barbara Bush stand for the National Anthem at the Kennedy Center, Monday, March 21, 2011, in Washington, before the "All Together Now - A Celebration of Service" performance in honor of former President George H. W. Bush. (AP Photo/Carolyn Kaster) ( Bush Volunteer Service )

In this Oct. 3, 2008 file photo, former first lady Barbara Bush speaks at a dedication ceremony for the George and Barbara Bush Center at the University of New England, in Biddeford, Maine. (AP Photo/Robert F. Bukaty, File) ( Barbara Bush Hospitalized )

President George W. Bush, right, sits with, from left, his brother Neal Bush; his mother, former first lady Barbara Bush; his wife first lady Laura Bush; and father, former President George H.W. Bush, as they take part in a reception in honor of the Points of Light Institute, Wednesday, Jan. 7, 2009, in the East Room at the White House in Washington. (AP Photo/Ron Edmonds) ( Bush )

Former President George H.W. Bush and wife, Barbara, arrive at the U.S. Capitol in Washington, Tuesday, Jan. 20, 2009, for the swearing-in of President-elect Barack Obama and Vice President-elect Joe Biden. (AP Photo/Ron Edmonds) ( Obama Inauguration )

Former first lady Barbara Bush hands out awards at ceremony for Literacy Maine, Wednesday, June 15, 2011, in Biddeford, Maine. The Barbara Bush Foundation for Family Literacy awarded grants to provide quality family literacy programming. As of June 2011, the Foundation has awarded over $40 million to 902 family literacy programs. (AP Photo/Robert F. Bukaty) ( Barbara Bush Literacy )

DALLAS, TX - APRIL 25: In this handout provided by the George W. Bush Presidential Center, former U.S. presidents (L-R) Jimmy Carter, Bill Clinton, George H.W. Bush, George W. Bush and President Barack Obama and former first ladies (L-R) Rosalyn Carter, Hillary Clinton, Barbara Bush, Laura Bush and first lady Michelle Obama pose at the opening of the George W. Bush Presidential Center April 25, 2013 in Dallas, Texas. (Photo by Paul Morse/George W. Bush Presidential Center via Getty Images) ( George W. Bush Library Dedication Attended By President Obama And Former Presidents )

Former First Lady Barbara Bush (C) takes pictures with her son former Florida governor Jeb Bush and First Lady Michelle Obama (L) as her husband former US president George Bush is awarded the Medal of Freedom on Feburary 15, 2011 at the White House in Washington. (TIM SLOAN/AFP/Getty Images) ( Was3714045 )

Former US First Lady Barbara Bush smiles during the George W. Bush Presidential Center dedication ceremony in Dallas, Texas, on April 25, 2013. (JEWEL SAMAD/AFP/Getty Images) ( Was7484571 )