They left the confined, insular community of their elite Knickerbocker class, rejecting the world of inherited wealth into which they had been born, identifying instead with the aspirations of the working class, immigrants and the disenfranchised. Their commitment to social change and economic justice still stands at the heart of all progressive agendas. Not only was Theodore Roosevelt's Square Deal the model for the New Deal, Teddy had also preceded Franklin and Eleanor in betraying their class. And at the 1935 Lincoln Day dinner of the National Republican Club, Theodore Roosevelt Jr. in effect disavowed his father's progressivism. His father had been accused of most of those sins.
People have many potential disloyalties.
They can betray a spouse, a family, an employer or employee. People cannot be equally loyal to all the above. They must make choices. In 1912, Theodore Roosevelt was disloyal to his political power base, the Grand Old Party. Eleanor would be disloyal to her class and occasionally to her family as her loyalty to her widening circle of friends grew.