Photos:: Barbara Bush | 1925-2018

Raisa Gorbachev, left, and Barbara Bush watch their husbands take the stage for a live global broadcast along with former British Prime Minister Margaret Thatcher in San Francisco on Oct. 1, 1995. The event was part of the State of the World Forum.  (Eric Risberg / Associated Press)

Barbara Bush reacts to Sen. Phil Gramm, who delivered the keynote address to the Republican National Convention at the Houston Astrodome on Aug. 18, 1992.  (Marcy Nighswander / Associated Press)

Barbara Bush holds the Bible for President George H.W. Bush as he is sworn into office as the 41st president by Chief Justice William Rehnquist outside the Capitol on Jan. 20, 1989.

Barbara Bush and son Jeb at a political rally for his Florida gubernatorial campaign at the Sun City Center in Hillsborough, Fla., on Oct. 21, 1998.  (Robert Burke / Associated Press)

Barbara Bush addresses the crowd during the 2000 Republican National Convention in Philadelphia on Aug. 1.

Former President Ford speaks with Barbara Bush at the 2000 Republican National Convention in Philadelphia.

Former presidents and first ladies pose during a dinner in honor of the 200th anniversary of the White House on Nov. 9, 2000. Barbara Bush is at the far left.  (Kenneth Lambert / Associated Press)

President George W. Bush gives his mother, Barbara, a kiss as his father watches at the U.S. Capitol after inauguration ceremonies on Jan. 20, 2001.

From left: George W. Bush, Laura Bush, George H.W. Bush, Barbara Bush, Bill Clinton, Hillary Clinton and Chelsea Clinton during the presentation of the colors at the National Day of Prayer and Remembrance Service in 2001 at the National Cathedral in Washington.

Former First Ladies Barbara Bush, right, and Nancy Reagan, former U.S. Secretary of State Colin Powell and former President Ford attend a memorial service in December 2002 in Philadelphia honoring Walter Annenberg, the billionaire media pioneer who died at 94.

Former President George H.W. Bush, First Lady Laura Bush, President George W. Bush and former First Lady Barbara Bush wave to reporters outside St. John’s church in Washington in 2003.   (Evan Vucci / Associated Press)

Former President George H.W. Bush snaps a photo of his wife, Barbara, on the closing day of the 2004 Republican National Convention at Madison Square Garden in New York.

Barbara Bush walks in front of George H.W. Bush, George W. Bush and Jeb Bush at a christening ceremony for the U.S. Navy’s new aircraft carrier the George H.W. Bush at Newport News, Va., on Oct. 7, 2006.   (Matthew Cavanaugh / EPA)

Barbara Bush kisses former President George H.W. Bush after his parachute landing on his 90th birthday in Kennebunkport, Maine, on June 12, 2014.   (Kenneth Wasley / Associated Press)