Daan Heerma van Voss has published a book about his “forced” father, following books by his mother and brother on the same subject. The book includes letters he sent to his father after his death. Heerma van Voss wrote that fathers cast a great shadow and that, as a child, a person may not always know whether they are still acting within it. He also told his mother that she would lose him as a son if she continued with what she was doing.