Joan Barry's daughter, Henrietta Joan Tiarks, became a successful model who later married Henry Robin Ian Russell, then the Marquess of Tavistock or the 14th Duke of Bedford, where she became the Dowager Duchess of Bedford.
Joan Barry's grandson, Andrew Ian Henry Russell, is presently the 15th Duke of Bedford, though he was born in Boston, Massachusetts.
She had two children with her only husband, Henry Frederic Tiarks III, a wealthy merchant banker. A daughter, Henrietta Joan Tiarks and a son, Edward Henry Tiarks who died when he was only six months old in 1943.