Until their divorce in 2000, he was married to Sophia, the daughter of Andreas Papandreou, former Prime Minister of Greece. In Papandreou's will, as publicly disclosed on 13 September 1996, he described Katsanevas as a "disgrace to the family" and said that "his aim was to politically inherit the history of struggle of Georgios Papandreou and Andreas Papandreou". Papandreou's four children objected to their father's will, in which he left his entire estate to his third wife, former airline hostessDimitra Liani. Papandreou's relationship with Liani had been a source of controversy during his last years in public office, when his health was failing. He had placed Liani in charge of his office, and opponents of Papandreou alleged that she was overstepping the bounds of her authority and seeking to advance a political career of her own. Liani became the subject of unfavourable news media attention, including publication, by the newspaper Avriani of old photographs that showed her naked with men and other women. These photographs were immediately denounced as "crude photo-montage" and Liani accused Katsanevas of orchestrating the publicity against her; Papandreou supported her, seeking unsuccessfully to convince his three sons to ostracize their brother-in-law. Theodore Katsanevas disputes the validity of the will and in 2003 won a defamation trial against Spyros Karatzaferis, publisher of a newspaper which for some time in 1998 featured, every dayon the front page, a photograph of Katsanevas subtitled "Disgrace". However, the judgement in the case did not address the authenticity of the will. As a result of this matter being described in Katsanevas's biography in the Greek Wikipedia, he brought a lawsuit against a Greek Wikipedia user and administrator known by the user name "Diu", and the Greek Free/Open Source Software Society, although neither has any control over the Wikipedia. The judge temporarily ordered the administrator to remove the information from Wikipedia. The administrator complied, but the information was soon replaced by another editor. The temporary court order was reversed on 1 September 2014, while the main trial was still pending. The administrator noted that the lawsuit and publicity had produced a Streisand effect and that the original Greek article was now hosted in translation on multiple Wikipedias in English, Catalan, Polish, Yakut, French, German, Dutch, Spanish and Italian. The Wikimedia Foundation financially supported this Wikipedia user subject to defamation lawsuit in Greece. In 2018 the trial ended with Katsanevas dropping all claims.