In the Fall of 1963, Ed Kemper, now 14 years-old, was allowed to go to Los Angeles to the home which his father, Edmund Emil Kemper Jr. II, shared with his new wife, Elfriede Weber, and her son from a previous marriage, Gilbert Otto Brechtefeld, who was two years older than Kemper.
The second Mrs. Kemper quickly began to feel extremely ill-at-ease with her dour and hulking stepson, now more than six feet tall, hanging around the house and staring at her until she became upset. She began to get migraine headaches. Once the boy happened to catch a glimpse of her nude, in the bedroom. Later, Kemper recalled that he had felt sexually excited by this episode. And still later it would be reinterpreted, perhaps at his instigation, but at least by the journalists, as a sexual overture on the woman’s part: “…the woman had appeared naked before him, using her sexuality to take his father away from him.”
Kemper was in Los Angeles for only a few weeks when at his stepmother’s urging, his father sent him back to Montana to live with his mother and sisters. E. E. Kemper Jr. II told his son that he was financially unable to keep him.
A few months later, around Thanksgiving, Kemper ran away from home in Montana and returned to Los Angeles to see his father. Another incident had Kemper following his pregnant stepmother around the house, shutting all the drapes and blinds claiming it was too bright. Afraid, she opened them up again and told Kemper he needed to leave. Her son Gilbert happened to arrive home at that moment. He saw how scared his mother was and how creepy Kemper was acting. He grabbed a hammer and chased Kemper away. This incident was apparently the reason why Kemper was sent to live with his paternal grandparents in late 1963. His father brought him to North Fork in California for Christmas and left him there once the holidays were over.
Kemper’s father and Elfriede Weber had a son together. He is known as David Weber but it’s not his real name. He keeps his real name private for security reasons. He was born in 1963 or 1964. As for Elfriede’s first son Gilbert, he died in 1975 at the age of 28. We were unable to find the cause of death. Elfriede passed away in 2009 at the age of 89.
Sources: The Co-ed Killer by Margaret Cheney / Sacrifice Unto Me by Don West / https://www.dailymail.co.uk/news/article-5168247/Brother-Edmund-Kempner-speaks-time.html