Photo of Allyn Kemper from her 1967 high school yearbook as a sophomore student

When her older brother, Ed Kemper, was imprisoned at Atascadero for murdering their paternal grand-parents in 1964, Allyn Kemper, 13 at the time, was interviewed by authorities. She had this to say about him (Guy was his nickname in the family):

“Guy seemed to be a happy boy; but you could sometimes tell he was bothered by something. He had four close friends from which I can remember in the last seven years.

“He seemed to get along well with younger and older people than he. He would often try to copy boys of his age and would feel he couldn’t be like them so he would give up. When he would be walking down the street during the day, if he saw some teenage boys older [or] his age, he would walk across the street from them or go a different way unless I talked him into walking that way ‘cause they wouldn’t hurt him. This was only sometimes. He was very self-conscious and afraid people would not like him. One thing he was worried about was his height. He thought people liked short people better than tall. He liked people to say good things about him and would take little things that people say bad about him at heart.”

Source: Book Murder Capital of the World by Emerson Murray, 2021