Claude Shannon married Mary Elizabeth Moore, also known as Betty, who had been a mathematics 'human computer' at Bell Labs during WWII. They had three children: Robert James, Andrew Moore, and Margarita Shannon.

Shannon and Betty raised their three children in Winchester, Massachusetts. He was known as a playful and supportive father, encouraging their interests and creativity. He shared his passion for mathematics and science with his children, often engaging them in puzzles and games.

Shannon had a wide range of hobbies and interests outside of his professional life. He was a skilled chess player, even designing a chess-playing computer. He was also an avid juggler, unicyclist, and builder of mechanical devices, including robots, juggling machines, and a flame-throwing trumpet. His personal life was filled with curiosity, creativity, and a love of play.

In his later years, Shannon suffered from Alzheimer's disease. His cognitive decline gradually impacted his ability to pursue his intellectual interests and hobbies. Betty Shannon cared for him until his death.

Claude Shannon passed away in Medford, Massachusetts, at the age of 84. He was survived by his wife, Betty, and their three children. His legacy as the 'father of information theory' continues to inspire scientists and engineers around the world.