In the story The Miracle Worker, Capt. Keller and his son James are unable to communicate with every single other because Capt. Keller will not listen to James.
Each have pretty different personalities. Capt. Keller is a sturdy, stubborn, and easily angered kind of guy. James on the other hand is a kind and obedient kid that does what he is told. Even though with all their variations they each like Helen and want the greatest for her.