Lynda Bird Johnson Robb is the oldest living child of a U.S. President following the death of a United States Army officer who served as the United States Ambassador to where?
John Eisenhower: John Sheldon Doud Eisenhower (August 3, 1922 – December 21, 2013) was a United States Army officer and military historian. John Eisenhower:  In the administration of President Richard Nixon (his father’s vice-president), he served as United States Ambassador to Belgium.
i don't know