Sentenced to 45 months in prison for tax evasion on his daughter Steffi Graf's earnings between 1989 and 1993. He was released in 1998 after serving 25 months. (January 1996).
His widow, Britta, was Steffi's former babysitter. Steffi, Britta's parents, and Peter's uncle were the only ones who attended Peter and Britta's wedding at the Villa Meixner Cultural and Conference Center (Brühl, Germany).