Sasha Obama is the younger daughter of U.S. president Barack Obama. Her formal name is Natasha, but she is most often called by her nickname, Sasha. She was born in 2001 to Obama and his wife, Michelle Obama, who were married in 1992. Sasha Obama has one older sister, Malia, who was born in 1998. Both girls attended the private University of Chicago Laboratory Schools in Chicago until January of 2009, when they began attending Sidwell Friends School in Washington, D.C. Sasha Obama entered the fourth grade in 2010. Her father became president on 20 January 2009, and in 2012 he was re-elected for a second four-year term as president.Sasha is the youngest child to reside in the White House since JohnF. Kennedy,Jr. arrived as an infant in 1961.