Mary Whitney is Sarah and Chase's cousin, a humorous, clever, sneaky, and independent woman who doesn't let the fact that she is blind get in her way. Her horse is Prince, whom she receives after Sarah has trained him. Mary appears in the episode "A True Gift." She has clever comebacks for most insults that Chloe and Zoey throw at her. She dislikes it when people are overprotective of her. She loves horses and riding, especially outdoors.