The Roosevelts and the Royals is based on interviews with five Roosevelt grandchildren and on previously unpublished letters of Franklin and Eleanor Roosevelt, King George VI, Queen Elizabeth, Queen Elizabeth II, the Duke of Windsor, and the Duke of Kent found in the FDR Library and the Royal Archives at Windsor Castle. The letters are published here by the gracious permission of Her Majesty Queen Elizabeth II. The book was supported by The Queen Mother, who offered comments about the Roosevelts in the last months of her life.

The author represented the Roosevelt family and the FDR Library in negotiations with the Queen Mother's private secretary, Sir Alastair Aird, to choose comments from the Queen Mother for a plaque to commemorate the 1939 visit of the king and queen to Hyde Park. This plaque, with The Queen Mother’s thoughts about the Roosevelts and the royal visit, is now placed at Roosevelt’s Top Cottage in remembrance of the famous hot dog picnic, hosted by the Roosevelts for the king and queen.