Mildred was the younger and only sister of Helen Keller. Their relationship did not start on a good note owing to jealousy on the part of Helen. Helen was jealous that her mother paid more attention to Mildred. However, with time, the two sisters developed a loving bond. Even without a proper language for communication, the two sisters hearts felt for each other. They had long walks together and often Mildred would explain the sceneries to Helen. Later, Mildred joined theCambridge Schoolwith Helen and the two sisters spent some memorable years there inNew York.