Hans Heinrich Thyssen-Bornemisza

As part of an attempt to dissolve a trust, thereby acquiring control of her third husband's assets, Tita cast doubt on the paternity of Baron Georg Heinrich Thyssen-Bornemisza, alleging that his father was actually Count Iván Batthyány de Német-Ujvár (1910–1985), the husband of Thyssen's sister, Countess Margit Batthyány (1911-1989). However, a settlement was reached between the parties before the baron's death, which brought to a "peaceable" conclusion the wrangling over control of the vast Thyssen art collection, which is to remain in Spain, Hans Heinrich having been the founder of the Thyssen-Bornemisza Museum in Madrid. One of the paintings in the museum, Rue Saint-Honoré in the Afternoon, Effect of Rain by Camille Pissarro, belonged to a Jewish couple who were forced to give it to the German government in exchange for an exit visa to the United Kingdom shortly after Kristallnacht in 1939.[2] By 2015, their descendants had filed a lawsuit against the museum, on the grounds that it was stolen by the Nazis.[2]

Coat of arms of Hans Heinrich Thyssen-Bornemisza

His second marriage was in Colombo, Ceylon, or Paris, 23 June 1954, Anglo-Indian fashion model Nina Sheila Dyer (1930–1965), an heiress to properties in Ceylon; they had no children and divorced on 4 July 1956, pursuant to the settlement of which she received a château in France. She later married and divorced Prince Sadruddin Aga Khan and committed suicide in 1965.

He married for the third time at Lugano-Castagnola on 17 September 1956 New Zealand-born British photographic and fashion model Fiona Frances Elaine Campbell-Walter (b. Takapuna, New Zealand, 25 June 1932). They divorced on 20 January 1965, and she went on to have a well-publicized relationship with Greek shipping heir Alexander Onassis, the only son of Aristotle Onassis. She was a daughter of Rear Admiral Keith McNeil Walter (later Campbell-Walter) (1904–1976), aide de camp of King George VI and his wife, Frances Henriette Campbell (born in 1904), a maternal granddaughter of Sir Edward Campbell, 1st Baronet. Their children were:

• Baroness Francesca Thyssen-Bornemisza (born Lausanne, 7 June 1958), married at Mariazell, 31 January 1993 to Karl Habsburg-Lothringen (divorced in 2017), heir to the defunct Austro-Hungarian imperial throne, and had issue.
• Baron Lorne Thyssen-Bornemisza de Kászon (born 15 June 1963), who converted to Islam; he is the producer and director of the 2003 film, "Labyrinth" and executive produced "The Garden of Eden" in 2008. He is the Chairman of Thyssen Petroleum and founder of the Kallos Gallery in London. He married in 2005 Alexandra Wright; they have one daughter.

He married for the fourth time at Lugano-Castagnola, 13 December 1967, Lilian Denise Shorto (b. Recife, 23 December 1942), a Brazilian banker's daughter, from whom he was divorced 29 November 1984. They had one son:

• Baron Wilfrid "Alexander" August Thyssen-Bornemisza de Kászon (born Zurich 1974), unmarried and without issue.

His fifth and final marriage was in Daylesford, Gloucestershire, on 16 August 1985, María del Carmen Rosario Soledad Cervera y Fernández de la Guerra, popularly known as Carmen "Tita" Cervera, (born Sitges, Barcelona, 23 April 1943), who was Miss Spain in 1961. They had no children, but Hans Heinrich adopted her son, Alejandro Borja (born Madrid, 1980, son of Manuel Segura), who married at Barcelona, 11 October 2007 Blanca María Cuesta Unkhoff[3] and had two children: Sacha Thyssen-Bornemisza de Kászon on 31 January 2008 and Eric Thyssen-Bornemisza de Kászon on 5 August 2010. His widow has also adopted two baby girls, twins, called Guadalupe Sabina and María del Carmen in July 2006.

Hans Henrich died in Sant Feliu de Guíxols, Spain. He is buried in the family burial vault of Schloss Landsberg in the Ruhr valley near Essen, Germany.