Thelma Morgan had two sisters: Gloria (her identical twin, the mother of Gloria Vanderbilt, the fashion designer and artist and mother of news anchor Anderson Cooper) and Laura Consuelo Morgan (aka Tamar), who was married to three men in succession: Count Jean de Maupas du Juglart (a French nobleman); Benjamin Thaw Jr. of Pittsburgh;[6] and Alfons B. Landa, president of Colonial Airlines and vice-chairman of the finance committee of the Democratic National Committee in 1948.

Furness described her leading role in Aphrodite to The New York Times as that of "an American girl, brought up under the sinister influence of an old Egyptian woman."

She also had small parts in the films Enemies of Women (1923), a William Randolph Hearst production whose cast included Lionel Barrymore and Clara Bow, So This Is Marriage?

Furness first met the Prince of Wales at a ball at Londonderry House in 1926[15] but they did not meet again until the Leicestershire Agricultural Show at Leicester on 14 June 1929.

[16][17] Edward asked her to dine and they met regularly until she joined him on safari in East Africa early in 1930, when a closer relationship developed.

[18] On Edward's return to Britain in April 1930 she was his regular weekend companion at the newly acquired Fort Belvedere until January 1934.

She also entertained him at her London home, in Elsworthy Road, Primrose Hill, and the Furness country house, Burrough Court, in Leicestershire.

While Furness was in the US with Aly Khan, Wallis Simpson stayed in her Mayfair home, 22 Farm Street, and entertained the Prince of Wales there.

In her bag was this miniature teddy bear that the Prince of Wales had given her, years before, when she came to be with my mother at the custody trial, and it was worn down to the nub".