well, as promised, here the list of the Benelux royals as far as I could trace, so not complete; if anyone could fill in the blanks..
Belgium:
Princess Joséphine-Charlotte:
- Prince Charles of Belgium, Count of Flanders
- Grand Duchess Charlotte of Luxembourg
King Baudouin:
- King Albert I of the Belgians
- Princess Margrethe of Bourbon-Parma, born Princess of Denmark
King Albert II:
- Prince Felix of Luxembourg
- Queen Elisabeth of the Belgians
The duke of Brabant:
- King Leopold III of the Belgians
- Donna Luisa Ruffo di Calabria
Princess Elisabeth:
- Archduke & Prince Amedeo of Austria-Este & Belgium
- Countess Hélène d'Udekem-d`Acoz
Prince Gabriël:
- Count Charles-Henri d’Udekem-d’Acoz
- Baroness Hans-Ulrich von Freyberg, née Maria-Christina Rossi di
Montelera
Princess Astrid:
- Don Fabrizio Ruffo di Calabria, eldest brother of Paola
- Princess Joséphine-Charlotte of Luxembourg (later on Grand Duchess)
Archduke & Prince Amedeo:
- Prince Filip of Belgium
- Princess (actually Queen) Paola of Belgium
Archduchess & Princess Maria-Laura:
- Archduke Gerhard of Austria (eldest brother of Lorenz)
- Archduchess Maria Beatrice, Countess von Arco-Zinneberg (eldest sister of Lorenz)
Archduke & Prince Joachim:
Archduchess & Princess Luisa-Maria:
- Archduke Martin of Austria-Este
- Pilar Escriva de Romani (niece of Queen Fabiola)
Archduchess & Princess Laetitia-Maria:
- Archduke & Prince Joachim (her brother)
- Princess Nora of Liechtenstein
Prince Laurent:
- Don Bettino Ricasoli (married to Paola's second sister Donna Laura)
- Duchess Sophie of Arenberg, born Princess of Bavaria----------
Luxembourg:
Grand Duke Jean:
Princess Marie-Astrid:
- King Leopold III of the Belgians
- Grand Duchess Charlotte of Luxembourg
Archduchess Marie-Christine:
Archduke Imre:
Archduke Christoph:
Archduke Alexander:
Archduchess Gabriëlla:
Grand Duke Henri:
- Prince (now King) Albert of Belgium
- Princess Marie-Gabrielle of Luxembourg
Prince Guillaume:
- Prince Guillaume of Luxembourg (*1963)
- Princess Marie-Astrid of Luxembourg andArchduchess of Habsburg
Prince Félix:
- Maria Teresa's sister, Catalina
- Prince Jean, Henri's brother
Prince Louis:
- Henri's sister Margaretha of Lichtenstein
- Xavier Sanz (the mutual family friend who introduced Henri and Maria Teresa in 1976)
Princess Alexandra:
- Henri's cousin Prince Michel de Ligne (son of Princess Alix)
- Princesss Maria-Anna Galitzine (nee Austria)
Prince Sebastian:
- Prince Guillaume of Luxembourg (his brother)
- Archduchess Astrid of Austria-Este, Princess of Belgium
Prince Jean:
- Prince Felix of Luxembourg
- Princess Margaretha of Denmark, born Princess of Sweden (eldest sister of Queen Astrid)
Princess Marguerite:
- Prince Felix of Luxembourg
- Princess Margaretha of Denmark, born Princess of Sweden (eldest sister of Queen Astrid)
Princess Maria-Annunciata:
Princess Marie-Astrid:
Prince Joseph-Emmanuel:
Prince Guillaume:
Prince Paul-Louis:
- Prince Guillaume of Luxembourg (*1981)
-
Prince Léopold:
- Elvire Paste de Rochefort (ex-fiancée to the son of Benedikte of
Denmark)
- Archduke Martin of Austria-Este
Princess Charlotte:
- Dona Pilar Mendez de Vigo y Löwenstein (now duchess of oldenburg)
- Philippe Jaczynski
Princess Elisabeth:
Princess Marie-Adelaide:
Princess Marie-Gabriëlle:
Prince Charles:
Princess Alix:
---------
Netherlands:
Queen Juliana:
Queen Beatrix:
- King Leopold III of Belgium
- Duke Adolf of Mecklenburg-Schwerin
- Princess Alice, coutess of Athlone
- Countess de Kotzebue
The prince of Orange:
- Prince Bernhard of the Netherlands
- Gosta von Amsberg née Freein von dem Bussche
- Queen Margrethe II of Denmark
- Fürst Ferdinand von Bismarck
- Mrs Renée Smith née Lady Roëll
- Prof. Dr. Jelle Zijlstra (prime-minister at the time)
Princess Catharina-Amalia:
- unknown
Prince Johan-Friso:
- Queen Juliana
- Crownprince (now King) Harald of Norway
- Christina von Amsberg
- Johan Christian Frieherr von Jenisch
- Dr. J.H. van Royen
Prince Constantijn:
- Aschwin Prince zur Lippe-Biesterfeld
- Axel Freiherr von dem Bussche-Streithorst
- Mrs. C. de Beaufort-Sickinghe
- Dr. Max Kohnstam (founding father of Europe)
- King Constantine of Greece
Princess Eloïse:
- CP Haakon of Norway
- Prince Johan-Friso of the Netherlands
- Princess Maria-Carolina of Bourbon-Parma
- Sophie de Wouw
Princess Irene:
- Queen Elizabeth of the United Kingdom of Great-Britain & Northern
Ireland (the Queen Mother)
-
Prince Carlos jr.:
- Queen Juliana of the Netherlands
- Prince Xavier de Bourbon de Parme
Prince Jaime:
- Prince Bernhard of the Netherlands
- Princess Madeleine de Bourbon de Parme
Princess Margarita:
- Crown Princess Beatrix (now Queen)
- Prince Sixte de Bourbon de Parme
Princess Maria-Carolina:
- Prince Claus of the Netherlands
- Princess Christina of the Netherlands
- Princess Maria-des-Neiges de Bourbon de Parme
Princess Margriet:
- FDR Roosevelt
- Crown princess Märtha of Norway (née Princess of Sweden)
- Dutch merchant fleet
Prince Maurits:
- Princess Christina of the Netherlands
- Hereditary Prince Aloys zu Löwenstein-Wertheim-Rosenberg
- Jkhr. G. Krayenhof
- The Dutch Merchant Fleet
Prince Benrhard jr:
- Prince Bernhard of the Netherlands
- Mrs C. Evelein née Baronesse Bentinck
- Ms. J. Fleischman
- Mr. J. Baron van Boetzelaer
- The Royal Air Force
Prince Pieter-Christiaan:
- Crown Princess Beatrix
- Mr. P. van Vollenhoven (paternal grandfather)
- Archduke Michael of Austria
- Mrs. M. Drabbe née Lady de Graeff
- Jkhr Mr. J. Reuchlin
Prince Floris:
- Princess Irene of the Netherlands
- Archduchess Maria Christine of Austria (wife of Archduke Michael)
- Mr. Robert McChesney
- Dr. J.W. de Pous
- Drs. F. Philips (thé Frits Pilips)
- Mr. F.A. Bierman
Princess Marijke:
- Sir Winston Churchill
- ?
Bernardo Guillermo:
- Princess Irene of the Netherlands
- Prince Claus of the Netherlands
- Ms. M.A. McTague
- Mr. J. Chapin
Nicolas Guillermo:
- Princess Margriet of the Netherlands
- Lady C.E.B. Roëll (lady-in-waiting & friend of HM Queen Juliana)
- Mrs. E. Pardies
- Mr. T. Daily
- Mr. F.O. Kielman
- Mr. S. Sesink
Juliana Guillermo:
- Queen Bearix
- Ms. S. Ryan
- Mr. Ch. Huyskamp
- Mr. J. Behlau