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Former first lady Barbara Bush attends day two of the Republican National Convention (RNC) at the Xcel Energy Center on September 2, 2008 in St. Paul, Minnesota. (Photo by Scott Olson/Getty Images)

 
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George and Barbara Bush point to well-wishers during the first day of the Republican National Convention, July 31, 2000 in Philadelphia. (Photo by Chris Hondros/Newsmakers/via Getty Images)

 
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Barbara and George Bush on their honeymoon at The Cloister on Sea Island, Georgia in January 1945 (Photo credit: George Bush Presidential Library and Museum).

 
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George and Barbara Bush on their wedding day in Rye, New York on January 6, 1945 (Photo credit: George Bush Presidential Library and Museum).

 
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George and Barbara Bush on their wedding day in Rye, New York on January 6, 1945 (Photo credit: George Bush Presidential Library and Museum).

 
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George and Barbara Bush on their wedding day in Rye, New York on January 6, 1945 (Photo credit: George Bush Presidential Library and Museum).

 
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An infant George W. Bush with his mother Barbara Bush and his father George Bush posing for a portrait in New Haven, CT, April 1947. (Photo by Newsmakers/via Getty Images)

 
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Barbara Bush and George Bush pose with children Neil Bush, George W. Bush, Jeb Bush and Marvin Bush in 1956. (Photo by Newsmakers/via Getty Images)

 
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The George Bush Family in Houston, TX, 1964 (Photo credit: George Bush Presidential Library and Museum).

 
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The George Bush family (left to right, front row - Neil, Marvin, Jeb; back row - Doro, George W., Barbara, George), taken in the early 1960s (Photo credit: George Bush Presidential Library and Museum).

 
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The Bush family in front of the United States Capitol, Washington, DC (l-r Doro, Marvin, Neil, Jeb, George W., Barbara, George), 1967 (Photo credit: George Bush Presidential Library and Museum).

 
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George Herbert Walker Bush takes the oath of office as the 41st President of the United States at the U.S. Capital, Washington, D.C. on January 20, 1989 (Photo credit: George Bush Presidential Library and Museum).

 
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President and Mrs. Bush attend an Inaugural Ball at the D.C. Armory on January 20, 1989 (Photo credit: George Bush Presidential Library and Museum).

 
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Portrait of the Bush family in front of their Kennebunkport, Maine August 24, 1986. (Photo by Newsmakers/Getty Images)

 
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George Bush and his wife Barbara sit in their bed as six of their 14 grandchildren play around them in Washington, D.C. (Photo by Liaison)

 
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Former U.S. President George H.W. Bush and former first lady Barbara Bush attend a portrait unveiling at the George Bush Library April 21, 2003 in College Station, Texas. (Photo by Joe Mitchell/Getty Images)

 
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Former US President George H.W. Bush and former First Lady Barbara Bush smile as they are introduced at Bush's 80th birthday celebration at Minute Maid Stadium June 12, 2004, in Houston, Texas.  (Photo by Brett Coomer/Getty Images)

 
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President George W. Bush, Laura Bush, Jenna Bush, Barbara Bush, former President George H. W. Bush, former first lady Barbara Bush pose for a portrait with extended family on January 19, 2005. (Photo by Eric Draper/Whitehouse via Getty Images)

 
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Former President of the United States George Bush Sr. and wife Barbara Bush attend Game Four of the 2005 Major League Baseball World Series between the Chicago White Sox and the Houston Astros on October 26, 2005. (Photo: Jed Jacobsohn/Getty Images)

 
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Film Subject President George H.W. Bush and his wife, Mrs. Barbara Bush attend the HBO Documentary special screening of "41" on June 12, 2012 in Kennebunkport, Maine. (Photo by Michael Loccisano/Getty Images for HBO)

 
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Former President Barack Obama, former first lady Barbara Bush, former President George H.W. Bush, former President George W. Bush and former first lady Laura Bush at the George W. Bush Presidential Center. (Photo by Kevork Djansezian/Getty Images)

 
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Former first lady Barbara Bush greets her husband and former U.S. President George H.W. Bush with a kiss after his successful skydive down to St. Anne's Episcopal Church on June 12, 2014 in Kennebunkport, Maine. (Photo by Eric Shea/Getty Images)

 
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Former President George H.W. Bush and former First Lady Barbara Bush are introduced prior to game three of the American League Division Series between the Houston Astros and the Kansas City Royals on October 11, 2015. (Photo: Bob Levey/Getty Images)

 
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Former president George Bush gives thumbs up as wife, Barbara Bush looks on before game one of the National League divisional series at Enron Field in Houston, Texas. The Braves won 7-4. (Credit: Brian Bahr/ALLSPORT via Getty Images)

 
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President George H.W. Bush flips the coin with wife Barbara Bush during Super Bowl 51 between the Atlanta Falcons and the New England Patriots at NRG Stadium on February 5, 2017. (Photo by Al Bello/Getty Images)