Ông bà Barack Obama và Michelle Obama với 2 con gái Malia Ann (bên trái) và Natasha (bên phải).

US President Barack Obama (2nd L), First Lady Michelle Obama (L) and daughters Malia (2nd R) and Sasha (R) disembark from Air Force One at the Jose Marti International Airport in Havana on March 20, 2016. Obama arrived in Cuba to bury the hatchet in a more than half-century-long Cold War conflict that turned the communist island and its giant neighbor into bitter enemies. AFP PHOTO/Nicholas KAMM / AFP / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

U.S. President Barack Obama and his daughter Malia walk from Marine One to board Air Force One upon their departure from O’Hare Airport in Chicago April 7, 2016. REUTERS/Kevin Lamarque

HONOLULU, HI – DECEMBER 30: (AFP-OUT) U.S. President-elect Barack Obama embraces his older daughter Malia as younger daughter Sasha looks on before entering the Honolulu Zoo December 30, 2008 in Honolulu, Hawaii. Obama and his family have been in his native Hawaii since December 20 for the Christmas holiday. (Photo by Kent Nishimura-Pool/Getty Images)

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President Barack Obama, First Lady Michelle Obama, and their daughters, Sasha and Malia, sit for a family portrait in the Oval Office, Dec. 11, 2011. (Official White House Photo by Pete Souza)
This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.Ê

US President Barack Obama, First Lady Michelle Obama (L) and their daughters, Sasha (2nd L) and Malia (2nd R), after Obama spoke during the taping of “Christmas in Washington,” at the National Building Museum in Washington, DC, December 11, 2011. The show, hosted by Conan O’Brien, features performances and appearances by Justin Bieber, Cee Lo Green, Jennifer Hudson, Victoria Justice and The Band Perry and airs on television December 16. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

WASHINGTON – JANUARY 20: (AFP OUT) US President Barack Obama dances with his wife and First Lady Michelle Obama during the Western Inaugural Ball on January 20, 2009 in Washington, DC. President Barack Obama was sworn in as the 44th President of the United States today, becoming the first African-American to be elected President of the US. (Photo by Chip Somodevilla/Getty Images)

President Barack Obama, right, and first lady Michelle Obama participate in a Thanksgiving service project by handing out food at the Capital Area Food Bank on Wednesday, Nov. 27, 2013 in Washington. The Capital Area Food Bank distributes 30 million pounds of food annually. (AP Photo/ Evan Vucci)

WASHINGTON, DC – DECEMBER 15: U.S. President Barack Obama and first lady Michelle Obama, along with daughters Malia (left) and Sasha, sing during the finale of TNT’s “Christmas in Washington” on December 15, 2013 in Washington, DC. The program benefits the Children’s National Health System. (Photo by Martin H. Simon-Pool/Getty Images)

President Barack Obama, First Lady Michelle Obama, and their daughters, Malia and Sasha, sit for a family portrait in the Green Room of the White House, Sept. 1, 2009. (Official White House Photo)
Photo by Annie Leibovitz/Released by White House Photo Office
This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

President Barack Obama waves as he and his daughter Sasha walk from the White House to board Marine One, Friday, Dec. 18, 2015, in Washington, for the short trip to Andrews Air Force Base en route to San Bernardino, Calif. (AP Photo/Carolyn Kaster)

President Barack Obama, First Lady Michelle Obama, and daughters Malia and Sasha pose for a family portrait with Bo and Sunny in the Rose Garden of the White House on Easter Sunday, April 5, 2015.

President Barack Obama, First Lady Michelle Obama, and daughters Malia and Sasha pose for a family portrait with Bo and Sunny in the Rose Garden of the White House on Easter Sunday, April 5, 2015.
(Official White House Photo by Pete Souza)

WASHINGTON, DC – DECEMBER 15: U.S. President Barack Obama and first lady Michelle Obama, along with daughters Malia (left) and Sasha, sing during the finale of TNT’s “Christmas in Washington” on December 15, 2013 in Washington, DC. The program benefits the Children’s National Health System. Also shown are the president’s mother-in-law, Marian Robinson, and the program’s host, actor Hugh Jackman. (Photo by Martin H. Simon-Pool/Getty Images)

WEST TISBURY , MA – AUGUST 16: U.S. President Barack Obama (L) his daughter Malia Obama ride a bike during a vacation on Martha’s Vineyard August 16, 2013in West Tisbury, Massachusetts. Obama and his family are on a weeklong vacation. (Photo by Rick Friedman-Pool/Getty Images)

WASHINGTON, DC – JULY 04: U.S. President Barack Obama and first lady Michelle Obama walk down the South Portico stairs to work the rope line as they host a Fourth of July barbecue for military heroes and their families on the South Lawn of the White House on July 4, 2013 in Washington, DC. The president and first lady are hosting members of the military and their families in commemoration of Independence Day. (Photo by Ron Sachs-Pool/Getty Images)

President Barack Obama says goodbye to daughters Sasha and Malia Obama in the Diplomatic Reception Room of the White House before his departure to Arizona, May 13, 2009. (Official White House Photo by Samantha Appleton)
This photograph is provided by THE WHITE HOUSE as a courtesy and is for one time use only with the MORE Magazine article with First Lady Michelle Obama. This photograph may not be used online or archived. This photograph may not be manipulated in any way and may not otherwise be reproduced, disseminated, or broadcast without the written permission of the White House Photo Office. This photograph may not be used in any commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

FOR USE AS DESIRED, YEAR END PHOTOS – FILE – President Barack Obama kisses first lady Michelle Obama as their daughters Sasha, left, and Malia, second from left, look on during the Inaugural parade, Monday, Jan. 21, 2013, in Washington. Thousands marched during the 57th Presidential Inauguration parade after the ceremonial swearing-in of President Barack Obama. (AP Photo/Gerald Herbert, File)

President Barack Obama and daughter Malia Obama participate in a service project to commemorate the September 11th National Day of Service and Remembrance at DC Central Kitchen near the U.S. Capitol in Washington, D.C., Sept. 10, 2011. (Official White House Photo by Pete Souza)
This photograph is provided by THE WHITE HOUSE as a courtesy and may be printed by the subject(s) in the photograph for personal use only. The photograph may not be manipulated in any way and may not otherwise be reproduced, disseminated or broadcast, without the written permission of the White House Photo Office. This photograph may not be used in any commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

President Barack Obama, First Lady Michelle Obama, daughters Sasha and Malia, and mother-in-law Marian Robinson help distribute Thanksgiving food items at MarthaÕs Table, a food pantry in Washington, D.C., Nov. 24, 2010. (Official White House Photo by Pete Souza)

President Barack Obama talks with an employee as he selects a bone for Bo, the Obama family dog, during a stop at a PetSmart store in Alexandria, Va., Dec. 21, 2011. (Official White House Photo by Pete Souza)

HAVANA, CUBA – MARCH 20: First lady Michelle Obama, President Barack Obama, Malia Obama and Sasha Obama arrive at Jose Marti International Airport for a 48-hour visit on Airforce One March 20, 2016 in Havana, Cuba. Obama is the first President in nearly 90 years to visit Cuba, the last one being Calvin Coolidge. (Photo by Joe Raedle/Getty Images)

HAVANA, CUBA – MARCH 20: U.S. President Barack Obama (2nd L) his daughter Malia (C), 17, and and other members of the first family pause to look at a statue of Cuban independence hero Carlos Manuel de Cespedes during a walking tour of in the plaza of the 18th century Catedral de San Cristobal de la Habana in the historic Old Havana neighborhood March 20, 2016 in Havana, Cuba. Obama is the first sitting president to visit Cuba in nearly 90 years. (Photo by Chip Somodevilla/Getty Images)

HAVANA, CUBA – MARCH 20: (L-R) Sasha Obama, 14, first lady Michelle Obama, U.S. President Barack Obama and Malia Obama, 17, pause to look at a statue of Cuban independence hero Carlos Manuel de Cespedes during a walking tour of the plaza of the 18th century Catedral de San Cristobal de la Habana in the Old Havana neighborhood March 20, 2016 in Havana, Cuba. Obama is the first sitting president to visit Cuba in nearly 90 years. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC – JANUARY 21: U.S. President Barack Obama (L) is sworn inas First lady Michelle Obama and daughters, Sasha Obama (R) and Malia Obama look on during the public ceremonial inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Justin Sullivan/Getty Images)

during the final day of the Democratic National Convention at Time Warner Cable Arena on September 6, 2012 in Charlotte, North Carolina. The DNC, which concludes today, nominated U.S. President Barack Obama as the Democratic presidential candidate.