What was the name of Stephen Hawking's adopted brother?

Stephen Hawking’s adopted brother was named Edward Hawking.

Edward was adopted by Stephen’s parents, Frank and Isobel Hawking, and joined a family that already included Stephen and his two younger sisters, Philippa and Mary. He was considerably younger than Stephen and was still a toddler during Stephen’s childhood.

The Hawking family lived in St Albans, Hertfordshire, where Stephen developed an early fascination with how the world worked. His father was a medical researcher, while his mother had studied philosophy, politics and economics at Oxford. The family valued learning, although Stephen was not initially considered an exceptional student.

The name can be confused with Stephen’s sons, Robert and Timothy, or his daughter, Lucy. Edward was not one of Stephen Hawking’s children; he was his adopted sibling. Hawking later became known for his work on black holes, cosmology and the popular-science book A Brief History of Time.